Andy Murray will open up the day's action against Gilles Simon, or perhaps Richard Gasquet.
With the best will in the world, I think everyone hopes that James Ward can bat around a dead rubber with Jo-Wilfried Tsonga in the day's second match.
We'll be here for it. Hope you will be too.
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Owain McLacey: Dunblane showing the tennis world how it's done! Well done to the Murrays
Rachel Crawford: That win was a thing of beauty.
Alana Bardill: Sensational! Well done @jamie_murray & @andy_murray. What a double act
Video highlights
That was like Super Saturday 2012.
You need to watch it again straight away, partly because you enjoyed it so much, partly because you believed it so little the first time round.
A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The nightmare of the Wimbledon men's doubles final last week is eradicated for Jamie Murray. He didn't play at his best there last week, but he has come out and performed today."
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The Special Two
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James: What a great game by the Murray brothers! Bring on Sunday.
Janine Pingree: Congratulations to the awesome Murray brothers! That was a fantastic match.
Meredith Lawrence: Well done Murray Bros
Captain reaction
Captain Leon Smith: "How good was that? Everyone talked about this being a key rubber, and it certainly was. Of course there's a lot of tennis still to be played but we're in a great position. I'm immensely proud of the brothers, the chemistry between them was phenomenal. There's no egos in the team at all, everyone accepts the decisions.
"We all know each other so well, we spend a lot of time together throughout the whole year so we know how to speak to each other.
"It's a tough day tomorrow, no-one should assume it's going to be an easy game for Andy because it won't be."
"If you look at who are winning the other Davis Cup quarter-finals, whoever wins this tie is the favourite to win this cup."
Player reaction
EPACopyright: EPA
Jamie Murray: "The crowd were amazing, twice as loud as yesterday. They cheered us from start to finish. We're in a good position to win the tie now."
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"I saw something new from Andy Murray today as a doubles player. He took the lead from his brother and they spurred each other on. There was no stopping them in the end and Andy is stepping up into that league where he can just dominate a whole weekend at the Davis Cup now."
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Andrew Castle
BBC tennis commentator
"This has been an advert for all that is good about British tennis but we must remember that this tie is not over yet by any means."
ReutersCopyright: Reuters
Player reaction
A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Getty ImagesCopyright: Getty Images
Andy Murray: "We played an unbelievably high level-match against a top team in a great atmosphere. To represent your country with your brother and to win a match like this is unbelievable.
"We both served well after the first game in which I was broken. We didn't give them too many opportunities. We kept a lot of energy on the court and returned really well. That made a big difference.
"It was not so much my groin as my hip. Everyone's fallen a few times on the court. It's sore but there's only one more match then I can rest after that.
"I'll get patched-up and hopefully put on another good performance They have such a strong team, you have to be at the top of your game to win."
Congrats from Down Under
Coach Darren Cahill adds his congratulations.
The winners of this tie will play either Cahill's native Australia or Kazakhstan in the next round
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray took 20 minutes to settle in at the start, but from that point on both he and Jamie were absolutely spectacular. The Brits were far superior in points won at the net and in the end it came back to that third set tie-break. How large a presence was Andy Murray?"
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Tom: Can we all take a moment to appreciate that Andy plays at all, let alone for 3 days straight after Wimbledon. Serbia no Djokovic. Canada without their best 2. Swiss had no Wawrinka or Fed last round.
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ReutersCopyright: Reuters
Jamie Murray and Andy Murray are interviewed courtside.
Andy hails their "really high-level tennis against a top team" and says that their returning was key to the win.
Jamie quips that he never imagined that they would represent GB together, saying "perhaps Andy, but not me!"
He adds that it hopefully puts GB "in a good position to win the tie" to wild cheers.
Full quotes to come.
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David Snelgrove: Never seen Andy Murray show so much emotion! Brilliant to see!! C'mon the Murrays
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Paige Marie Roberts: And just when I thought my time jumping around the living room screaming about tennis was over....C'MON MURRAY BOYS!!
Helen Lagadu: Loving the Davis Cup tennis. Great atmosphere, cracking game to watch. It's stopping me doing my paperwork.
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Mahut and Tsonga are not hanging around to bask in the aftermath of this defeat.
They scurry off with racquet bags over their shoulders just as the MC wraps his vocal cords around the long vowels in "Muuurrrreeee".
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Mike Roebuck: Scots carrying GB over the line. I feel like I'm watching curling!
Sam Jamaa: I remember how the Davis Cup was the springboard for Djokovic's supremacy. Getting ahead of myself here, but here's hoping!
Robin Armstrong: Don't think I've ever seen Andy so fired up in my life. Team GB daring to dream of the semi finals of the Davis Cup?
Game, set and match
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Good news for a Brit
Take that! Jamie Murray wallops away the final smash to start the party.
He and Andy wrap each other in hearty embraces and face-wide grins.
Getty ImagesCopyright: Getty Images
GB save two break points
A Murray/*J Murray 4-6 6-3 7-6 (7-5) 5-1 Tsonga/Mahut
Massive from Jamie Murray as he answers every pinging Tsonga forehand with a volleyed reply as GB get back to 15-15.
But France work up 15-40 and two break points.
The first is save with a clattering first serve.
Andy Murray claims the second with a regulation volley after another great tee-off.
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Andrew Castle
BBC tennis commentator
"Jamie Murray with the slightly nerve-wracking honour of serving-out this match."
PACopyright: PA
France hold
A Murray/J Murray* 4-6 6-3 7-6 (7-5) 5-0 Tsonga/Mahut
France cling on. But only by their fingernails.
Andy Murray flicks a backhand just wide and brother Jamie Murray with serve for the match next.
France taken to deuce
A Murray/J Murray 4-6 6-3 7-6 (7-5) 5-0 Tsonga*/Mahut
Andy Murray brings a tremendous rally to an end with a top-spinning cross-court pass that dips like a Roberto Carlos free-kick.
Deuce. Murrays both playing like men possessed and Britain two points away from the doubles rubber.
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Ian Rhodes: Andy Murray has got better and better as this match had gone on
Jane Stewart: Engrossing tennis, massive swing. But please, for the love of all things good, let's eradicate the phrase "virtual match points
Leigh: Great to see the Murray brothers so fired up! They have this rubber in the bag!
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The Murrays were off the pace in the first game of the first set, but since then they have been awesome. Their personality has shone through."
ReutersCopyright: Reuters
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Andy Murray is GB's chief cheerleader as well as singles top-dog and doubles compadre. I think he would carry the water and drive the bus as well if asked.
He loves it when tennis throws off the smart-casual formalities and gets raw and raucous. That is how it is right now.
He holds to 15 and Tsonga is serving to stay in the rubber.
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Lucy Brown: Amazing atmosphere at the Davis cup makes me want to be there
Jordan Holt: #murraymania Leon Smith really sending his team places this year!
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The French are reeling right now. They need to do something quickly, or they are out of here because Andy Murray has become more and more comfortable as this match has gone on."
"Let's go, let's go!" implores Kim Sears as brother-in-law Jamie hammers a smash off stage left for 0-30.
Hubby Andy lunges in to pat away a volley for 0-40 and three break points.
Team Murray don't play another shot. Nicolas Mahut serves a double-fault that is doing nothing for negative national stereotypes
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"You can get a little tight and a little conservative in this situation when you are ahead, but it's important to try and relax and press home the advantage. Both teams are dealing well with this surface because it's like they are playing on ice at times."
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One hold down. Three to go.
Jamie Murray booms down an ace to seal it and Jo-Wilfried Tsonga did not get anywhere near it with a half-hearted waft.
Tsonga took a tumble earlier it the game and looks thoroughly winded mentally as well as physically.
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Jamie: Don't want to jinx it, but #teammuzz look unstoppable at the moment
Ruth Corrigan: Allez Les Scotties!
Donna Richardson: What an awesome set loving the #DavisCup talk about passion!! Great atmosphere come on GB
ReutersCopyright: Reuters
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Andrew Castle
BBC tennis commentator
"The format of this Davis Cup tournament may not suit some of the players, or their agents, or for that matter their earning potential. But they love it because of atmospheres like this. It has to be said France are teetering on the brink at the moment."
Britain break
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Good news for a Brit
Jo-Wilfried Tsonga tumbles, but can't get his racquet on the ball and keep it in play.
Andy Murray frothing with excitement, his French opponent downcast and the end possibly in sight.
Four more service holds and Britain are 2-1 up in the tie...
France save break point, but taken to deuce
A Murray/J Murray 4-6 6-3 7-6 (7-5) 1-0 Tsonga*/Mahut
A bit of controversy as Jo-Wilfried Tsonga's second serve is punished by Jamie Murray on the opening point.
France captain Arnaud Clement claims that Tsonga's failed attempt to scrape back a volley was affected by a rogue call of "out" from the crowd.
I doubt he was. Tsonga was a good 20m away and focused on the ball.
French rattled and they offer up a break point as Mahut blasts a regulation smash wide for 30-40.
Saved! But still deuce to work their way through...
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AFPCopyright: AFP
Jamie Murray with a delicious touch volley, feinting to hammer the ball and instead feathering it out of the reach of either Tsonga or Mahut.
Cheeky.
A solid hold to keep the mojo with the boys in darker blue.
GB win third set
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Tim Henman
Former British number one on Radio 5 live
"It shows how much it means to Andy Murray to be on the court with his brother with a full house playing for his country.
"When you see this atmosphere it's great. It can only help the game."
"Jamie Murray does not have a classical style by any means, but boy does he make it work as Britain take the crucial third set. Some picture-perfect returns in that tie-breaker. This is fun!"
GB win third set
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Andrew Castle
BBC tennis commentator
"What a wonderful set of tennis. It's uphill for the French from here. This has been a fantastic comeback by these brothers."
"How much did that mean to Andy Murray? That's a huge third set under the belt and the momentum is with GB."
Game and third set GB
A Murray/J Murray 4-6 6-3 7-6 (7-5) Tsonga/Mahut
Gotcha!
Andy Murray's return forces Tsonga to volley long and Queen's explodes upwards.
Britain need just one of the next two sets. Leon Smith likes those maths, standing back to applaud the Murrays after Andy eventually stops bouncing and starts sitting.
Tie-break
A Murray/J Murray 4-6 6-3 6-6 (6-5) Tsonga*/Mahut
France have a mini-break back as Jamie Murray slips on the stretch out wide. Andy Murray revives the mood as he slaps away. Back on serve, but set-point Britain...
Tie-break
A Murray/J Murray* 4-6 6-3 6-6 (5-4) Tsonga/Mahut
Mini-break Britain! A brilliant dipping return from Jamie, a precise pair of volleys from Andy and GB are two points away from the set...
ReutersCopyright: Reuters
Tie-break
A Murray/J Murray 4-6 6-3 6-6 ( 4-3) Tsonga/Mahut*
Two pinpoint, laser-guided bombs off the Andy Murray racquet and his serve is safe and sound. Over to you Monsieur Mahut...
Tie-break
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Jamie Murray holds serve, before Tsonga crashes down a 131mph ace to keep us on level pegging.
A Jamie return long down the line and France are ahead for the first time in the breaker. Andy to serve...
Tie-break
A Murray/J Murray* 4-6 6-3 6-6 ( 1-1) Tsonga/Mahut
A mini-break on the very first point for Britain as Jamie Murray snaps in.
But Jo-Wilfried Tsonga grabs it right back with a dipping return on to Jamie's toes.
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Once again, some solid first serves there from Andy which Tsonga just couldn't re-direct. He looks to have recovered quickly from his fall. Crisis mode health-wise over now."
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A Murray/J Murray 4-6 6-3 6-6 Tsonga*/Mahut
Maybe the hip flexor, inner groin or whatever it was that Murray hurt in the last game is like an appendix or your tonsils.
Nice to have, but more decoration than an essential component.
Andy launches down a ram-jammer of an ace to kick the game off and keeps serving massive to take us into a tie-break.
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Ian Rhodes: Fine piece of sportsmanship from @tsonga7 he was the first to go over to see if murray is ok
Sachin Patel: Never seen the crowd at Queens Club like this, a proper Davis Cup atmosphere
Jackie Grant: Get the Proclaimers on!
Andy Murray returns to action
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Andy Murray is back on the dancefloor.
He does not look the full ticket though as France polish off the final point of the game as it restarts at 40-15 up.
And it is Andy Murray to serve next.
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Piers Newbery
BBC Sport at Queen's Club
"Shane Annun takes centre stage, Murray's fitness trainer who has been in place since last year and to whom the Scot has paid glowing tribute in recent weeks. The worry, even if he recovers, is that Murray will have to take on Gasquet or Simon tomorrow. "Get up, stand up," booms Bob Marley over the PA. Bit harsh."
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Andrew Castle
BBC tennis commentator
"The French wouldn't wish an injury on anyone, but this is clearly potentially a big boost for their chances. A British team without Andy Murray is clearly a different proposition to one with him in."
Andy Murray receives treatment
Bad news for a Brit
AFPCopyright: AFP
I'll be honest with you. It does not look good.
Andy Murray is still clasping his hand across his face, breaking off only to grimace.
The DJ is keeping it light-hearted, firing up Bob Marley to instruct Britain's top dog to "get up, stand up, don't give up the fight."
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The physio just testing Andy out now to see what kind of strength he has in those muscles. Once he has identified what the issue is, he has three minutes in which to treat it.
"The incident happened when he was taken far out of court where the grass is so green, he had no chance for any traction whatsoever."
Andy Murray receives treatment
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ReutersCopyright: Reuters
This could be the whole match and a historic place in the Davis Cup last four resting on a tiny bit of tendon.
The trainer is on to work on Andy Murray. He has three minutes to produce a little magic.
What have you got medicine man?
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Andrew Castle
BBC tennis commentator
"Andy Murray looks in some trouble back there, certainly the noise wasn't good. Is it a hip flexor? We don't know at this stage. 'I told you about this' he says as he walks to the sideline. If it's popped, it's popped."
Andy Murray injures left leg
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Bad news for a Brit
ReutersCopyright: Reuters
Uh-oh.
Andy Murray has taken a heavy fall out wide as he chases down a Tsonga smash.
He went down with a squeal and has come up clutching his groin.
He limps to the courtside seat for treatment.
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Andrew Castle
BBC tennis commentator
"It's so tight. You feel as though the whole result of this match now rests on the outcome of this third set."
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I like what you have done there.
With their men looking safe at 40-0 up, the British hardcore, clad all in red, unveil a re-working of the football chant dedicated to the Toure brothers.
All together now. "Andy, Andy, Andy, Andy, Andy, Andy, Andy Murray. Jamie, Jamie..."
It works better out loud than in text.
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Colin Drennan: Good to see Jamie Murray getting credit for how great a player he is.
Jenny Jean-Paul: AC/DC and tennis. Now that's what I'm talking about.
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
ReutersCopyright: Reuters
"What a great atmosphere and an interesting choice of music at breaks in between games. I'm sure the Queen's Club hasn't had AC/DC playing out here too often in its history."
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Nicolas Mahut rattles through a service game to love.
The French fans are getting boisterous. Jamie Murray to try and pour a little cold water on them next.
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A Murray/J Murray 4-6 6-3 4-4 Tsonga/Mahut*
This set is gaining weight faster than a tourist in Texas.
Andy Murray breezes through a service game with Jo-Wilfried Tsonga wastefully blasting long on a second-serve return at 30-15 down.
We are heading into the business end of things. No margin for error. The winner of this one will be two-thirds of the way home.
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Jo-Wilfried Tsonga challenges a call against his attempted second-serve ace. That was very optimistic. It was out by a handle's length.
Forty-thirty and a glimmer for Great Britain.
But Jo-Wilfried snuffs out the hope with a slugged serve out wide. No need to call for the virtual replay gods. That was a squeaky clean ace.
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Andrew Castle
BBC tennis commentator
"France has a wonderful heritage in tennis. They have to 10 players ranked in the top 100 in the world at present, and if teams were made up of five men in this competition they would be strong favourites to win the lot."
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EPACopyright: EPA
Some canny and careful volleying from Andy Murray - keeping the ball right on Nicolas Mahut's toes to deny him any angle for a winner - is the highlight of a whistlestop hold to love.
France hold serve
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Andy Murray would be rubbish at poker. Every emotion is at the surface.
He screams abuse at himself and replays the stroke at a furious pace as he duffs a return into the net to hand over the game.
The DJ fires up Lady Marmalade, complete with the chorus repeated by every schoolboy day-tripper to France.
France taken to deuce
A Murray/J Murray 4-6 6-3 2-2 Tsonga/Mahut*
APCopyright: AP
The French have been pretty much impeccable on serve so far and Nicolas Mahut looks to be cruising at 40-15.
But Mahut volleys wide for 40-30, before Jamie Murray somehow manages to lay string on the ball as it is blasted at him to take the game to deuce.
A chance for Britain...
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray's service has been under pressure in recent games, but he's come through with flying colours and for me this is where the match turns if the Brits can just put a couple of good returns in."
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Ben Cookson: Are the female tennis players not involved at all in the Davis Cup? Or do they have a similar tournament ?
Rachael Collins: Why is Tsonga's top a different shade of blue to the rest of his team?
Martin Hotchkiss: Funny how the players don't need to towel their faces every point in doubles.
Ben - Fed Cup
Rachael - Individual sponsors
Martin - Too much fist-jabbing to be done
GB taken to deuce but hold
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EPACopyright: EPA
These French boys can do some retrieving.
Tsonga and Mahut are back with the line judges fishing back smashes before Jamie Murray finds the killer angle.
Tsonga's forehand fire takes the away side on to 30-30, before a brave second serve from Andy Murray - hard and wide - stretches Mahut out of shape.
Jamie Murray caught in two minds at the net whether to leave it or volley away a winner and does neither. Deuce.
But Andy Murray digs out twin brutes of serves to see off the danger.
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Golfer Justin Rose is backing the Brits from his sofa in St Andrews. He's got time on his hands after all with the third round of the Open delayed until Sunday now.
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"People have questioned why Gasquet isn't playing for France, but the tie is a long way from over yet. Keep your power dry on criticising the French just yet."
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James Matthews: I reckon Andy Murray has a live twitter feed in his ear when he plays - he performs best when naysayers appear.
Fay Partridge: Why didn't I get tickets for the Davis Cup!? I wanna see Jamie & Andy.
"I've just been down to the GB bench and the vibe was pretty excitable. There's real belief that this doubles rubber can be won.
"The other thing that struck me was what a fantastic view those in the front rows have. They are so close to the action they can see the players' emotions and almost hear what they are saying."
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Great Britain are still yet to win a point on the Tsonga/Mahut serve in this third set.
The changeover DJ has a licence to roam around his back catalogue. He puts on an incongruous slice of Rihanna to accompany the pat-down and rehydration session.
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A Murray/J Murray 4-6 6-3 1-1 *Tsonga/Mahut
Andy Murray on net duty while brother Jamie gets the rallies started from the back of the court.
The world number three's volleying is looking very sharp. Tsonga and Mahut's fetching is giving him plenty of practice, but Andy's overheads and angles are keeping them permanently on the back foot.
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Piers Newbery
BBC Sport at Queen's Club
The sound of The Proclaimers has come to mean Britain's Davis Cup hopes are on the rise, and it's Jamie Murray who is leading the way today.
While Andy has taken a while to reacquaint himself with the angles and dimensions of a doubles court, Jamie has been in Grand Slam final form. LTA chief Michael Downey is beaming courtside, the Canadian sportingly wearing a Union Jack covered jacket.
Player reaction after GB win second set
Britain's James Ward on BBC One: "The French didn't miss a ball in the first set, but the boys have bounced back well and now it's looking good."
Britain's Dom Inglot: "It doesn't matter in what capacity you are, you are part of the squad and I'm just happy to be here.
"I'm hoping for a 3-1 win for us. Andy missed a few first serves early on but you can see the bond with Jamie and they look more dangerous on the return than the French. I think there's even more to come."
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That was a punchy little service game from Nicolas Mahut. A game that says the fight is far from over.
The Frenchman puts away a deft volley, finding the angle past Jamie Murray and down the line.
Two big serves follow with flailing returns dribbling into the net as France hold to love.
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A Murray/J Murray 4-6 6-3 Tsonga/Mahut*
Andrew Castle
BBC tennis commentator
"The Murray brothers have bounced back and both teams need to re-group for the start of the third set. Queen's Club is now officially a little piece of Scotland."
Game and second set
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EPACopyright: EPA
Jamie Murray practically barges brother Andy out of the way to crash away a volley for 30-15.
Andy with the judgement of Solomon as he shoulders arms to allow Tsonga's forehand to fly past him and the net and a couple of inches long at the back of the court.
Nicolas Mahut fails to claw a final serve out of his ribs and the second set is Great Britain's.
Cue the Proclaimers.
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A Murray/J Murray* 4-6 5-3 Tsonga/Mahut
It could have been an early end. As it is Great Britain, and Jamie Murray in particular, will have to do it with the ball up their end of the court.
France are teetering at 0-30 before Jo-Wilfried Tsonga plucks three monster serves out off the rack.
Nicolas Mahut seals the game with a bulleted smash straight at Jamie after a dolly of a lob from Andy.
"Jamie Murray is incredibly sharp at the net and he's making the right decision in which way to move to anticipate the return."
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Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"If the Murrays played together in Grand Slam doubles, they would be a threat without a doubt. But I think those days are over due to the physical demands of singles these days and the schedule Andy faces with that."
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A Murray/J Murray 4-6 5-2 *Tsonga/Mahut
EPACopyright: EPA
A smart return from Jo-Wilfried Tsonga out-foxes and wrong-foots Jamie Murray at the net to pull the French back to 30-30 from 30-0 down.
Too much power on the next Andy serve though for Nicolas Mahut. His stroke is not anything more than a block, but the ball floats long.
Jamie gobbles up another Tsonga return, cracking the ball away onto Mahut's toes to seal the game.
Andy bounces off court like Zebedee.
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Tom Sanford: What an atmosphere inside Queen's for the tennis, come on Andy and Jamie!!!
Colin Livingstone: Am I right in hearing the Davis Cup crowd chanting England, England as the Murray brothers play?
Nadine Erskine: The atmosphere looks incredible. Wish I was there!
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Nicolas Mahut steadies a rocking French ship with a service hold.
The wind is in the home sails though.
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Tony Cocozza: Leon Smith places far too much emphasis on Andy Murray. Awful decision to break up a settled doubles team. Smith is blinkered.
I think Tony may have revised his opinion over the last couple of minutes.
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Andrew Castle
BBC tennis commentator
"That's a solid service hold, and Dunblane's finest have a 4-1 lead in the second set."
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A Murray/J Murray 4-6 4-1 Tsonga/Mahut*
And a hold to love from Jamie Murray to back up the break.
Jamie is punching air like a frenzied cagefighter going for the kill. The crowd are buzzing like it is last night of the Proms.
Rule Britannia. France looking like the sick man of Europe.
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A Murray/*J Murray 4-6 3-1 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray is slowly making the change from playing regulation doubles to Andy Murray doubles, and its effects are showing on the scoreboard."
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GB breaks
A Murray/J Murray* 4-6 3-1 Tsonga/Mahut
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On return, Andy Murray takes on Nicolas Mahut at the net, thumping low and hard across court and clearing the wire by only a whisker.
Mahut's volley is snaffled by the net. Thirty-all.
Brilliant by Andy Murray as he reacts like lightning to scoop a ball back and Mahut crashes a regulation forehand into the net.
Break point. A ball floats towards the British baseline. Murray watches it land and immediately calls for a Hawk-Eye review.
He looks like he has concerns. But it is long!
Britain have broken. Glory be!
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A Murray/J Murray 4-6 2-1 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"It's a sensible tactic from the Brits, bringing Tsonga's backhand into play if at all possible like they are doing. It just takes a few service holds allied with this crowd, and the French might just start to feel a bit claustrophobic"
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A Murray/J Murray 4-6 2-1 Tsonga*/Mahut
A commanding game for Great Murray as they do away with the French to love via a thumped smash from Andy, an angled volley from Jamie and a fluffed backhand from Jo-Wilfried Tsonga at the other end.
A good start to this set for the home duo.
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*A Murray/J Murray 4-6 1-1 Tsonga/Mahut
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Kim Sears is the first winner of the day.
Mrs Andy Murray has claimed a moral victory in her daily game of hide and seek with the cameras. It has taken until early in the second set before she is picked out of the crowd and appears on our screens sporting some big shades.
Nothing for her husband and brother-in-law in that game. A hold to love for Mahut.
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Ben: Huge risk bringing Andy into doubles. Jamie looks far more secure. Why break up proven pairing? Andy Murray plays three consecutive days too.
Ian: A mistake to pick Andy Murray. Dom Inglot, a doubles specialist, should be playing and he has a big serve. Wrong call by Leon Smith.
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A Murray/J Murray 4-6 1-0 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Serving first again in this second set, Britain need a series of good solid holds here to put some scoreboard pressure on the French. That first game was a good sign."
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A Murray/ J Murray 4-6 1-0 Tsonga/Mahut*
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Jamie Murray has a quick conflab with Andy as Allez les Bleus rings out and 15-30 pops up on the scoreboard.
A brilliant pick-up from Jamie and patted winner down the middle from Andy wins the next point, before Mahut's attempted lob drifts long under the concerned gaze of the Brits.
But there is still deuce to deal with...
And there is a familiar Scottish growl. Andy Murray hammers away a volley to close out.
A sweaty, but ultimately successful service game.
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Cammy Renwick: Would be interesting to know what Queen's Club members make of this crowd! Not your usual Moet brigade!
David Miller: We've missed a trick psychologically. Should have told French they can't play in blue like our boys. Home team choice!
"France have been almost faultless. They came out with great enthusiasm and energy, got the early break and have played with a lot of power."
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A Murray/*J Murray 4-6 0-0 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"The Blues in this part of London, well it is often Chelsea. But this time it's Les Bleus of France who are here and they have taken the first set. To win three of the next four sets against these two is going to be difficult for the Brits."
France win first set
A Murray/ J Murray* 4-6 Tsonga/Mahut
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Jo-Wilfried Tsonga overcooks a volley on the stretch and Great Britain have 15-15. Big Jo-Willy is chuntering to himself and I think it is something strong than "zut alors".
Nicolas Mahut has been right on point though and a sharp volley wins the next point before he hammers a smash into row Z via the Queen's Club turf to seal the set.
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A Murray/ J Murray 4-5 Tsonga*/Mahut
France will have to serve for the set.
Andy Murray's serve is locked down tight. And Great Britain have a chance for a bit of a brainstorm before Tsonga tries to close out the opener.
Leon Smith is on court during the changeover giving his men a few pointers.
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A Murray*/ J Murray 3-5 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"Give some credit to the French pair, they are serving really well to Andy Murray so far."
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*A Murray/J Murray 3-5 Tsonga/Mahut
Andy Murray will be giving the Queen's groundsman the cold shoulder if they pass in a clubhouse corridor later.
A dirty old bounce on the baseline - the ball scooting on at him like a Shane Warne flipper - messes up his backhand with Mahut and Tsonga vulnerable at the net and 30-15 on the board.
"Tsonga has been the outstanding player so far. He has played a fair bit of doubles, more than your average ATP Tour player, especially over the last 18 months.
"And he had a win with Gael Monfils, beating Jamie Murray and his regular partner John Peers in Monte Carlo earlier this year."
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A Murray/ J Murray 3-4 Tsonga/Mahut*
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy plays so little doubles, Jamie needs to take control and make him feel comfortable so he feels at his best. Only by doing that they will put fear into the French pair."
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A Murray/ J Murray 3-4 Tsonga/Mahut*
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The Great Britain and France ultras have been seated dangerously close to each other.
The steward will have to intervene if artisan loaves and two pound coins start flying between the two sets of hardcore fans in this swish part of West London.
It is the GB section who have bragging rights as Jamie Murray cranks down a whopper of a serve to hold to 30.
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A Murray/ *J Murray 2-4 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
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"Tsonga happy to roll the dice. He's going for it on second serve so clearly doesn't mind taking risks. It's worth the occasional double fault."
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A Murray/J Murray* 2-4 Tsonga/Mahut
Jamie Murray cracks away a volley and Great Britain have 15-30 and the first real sniff of a break.
But it is whipped away before their very eyes.
Jo-Wilfried Tsonga powers a serve out wide at 30-30. Jamie says it was good. Andy want to challenge. The umpire doesn't know which of the British brothers is in charge.
Andy gets his way. But he should have listened to his older brother. It was in by a fair stretch and France have blasted clear of a slightly sticky situation.
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Sporting siblings
Ed, Exeter: My personal favourites, Joe Cole and Andy Cole.
And, of course, their cousin Ashley. And musical great uncle Nat King.
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A Murray/J Murray 2-3 *Tsonga/Mahut
An Andy Murray double-fault sows a few seeds of doubt and brings up 15-15.
But he calls rank on Jamie to hit an overhead and then targets Tsonga with a flurry of volleys. The Frenchman eventually coughs up an ugly stroke that flops into the top of the net.
Game sealed.
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Murray*/Murray 1-3 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
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"The Murrays are trying to expose Tsonga, they think his doubles instincts are a little rusty but the French look good so far."
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*A Murray/J Murray 1-3 Tsonga/Mahut
Nicolas Mahut's serve, albeit it with help from John Isner's iffy returning, was one half of the longest match in Wimbledon history.
His tee-off looks in decent nick as France ramp up to 40-0.
Jamie Murray keeps cool, crashing away an overhead to bring back 40-30.
But it is too much of a gap to make up.
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A Murray/J Murray 1-2 Tsonga/Mahut*
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It is getting noisy at Queen's.
And not just between points.
Andy and Jamie Murray have a decent length of dialogue over who will put racquet on a Tsonga lob, before Andy wins the argument and takes charge.
Jamie nets a volley on the next shot though and France have 15-30.
The Murrays knuckle down to see off the danger, but they have been under the cosh in the first three games. Time for captain Leon Smith to earn his changeover corn with some words of wisdom.
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A Murray/J Murray* 0-2 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray has looked a bit tight to me early on, and he has not stuck away any volleys so far but that will change."
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A Murray/J Murray* 0-2 Tsonga/Mahut
Jo-Wilfried Tsonga trundles the heavy artillery up to the baseline and his big serves help France to 40-0.
Better from Great Murray as Andy gets a return to dip on Tsonga's toe and Jamie swats away a volley.
But that is all they are getting from that game.
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Sporting siblings
Ken Canty: How about the Charlton brothers? 1966 World Cup winners. Can't think of any other World Cup winning brothers?
Tsonga/Mahut break
Murray/Murray 0-1 Tsonga*/Mahut
Nicolas Mahut crushes a return, Jo-Wilfried Tsonga cannons another cross-court for a winner and France have 0-30.
Nervy times and the balls are barely out of can.
Dazzlingly quick reflexes from Jamie Murray at the net help Great Britain back to 30-30.
But Tsonga is swinging for home-run winners and Andy Murray does not look like he has quite got to grips with the crowded court.
A duffed volley off the frame of Andy's racquet hands the early break to France.
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Andy Murray to serve first.
The crowd finally settle and we are ready...
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Piers Newbery
BBC Sport at Queen's Club
"They don't look so good together," says a French journalist after watching Tsonga and Mahut warm-up. Apparently the pair have never trained together so much and it appears they were always in the plans of captain Arnaud Clement.
"There is some level of surprise from the French press room that the big serve of Dom Inglot will not be used, but the Londoner has hardly played recently due to injury, while Jamie Murray arrives off the back of a first Grand Slam men's doubles final.
"After all the intrigue and speculation, it could just come down to nerve. "You know this is the final," says our French friend. "Who wins the doubles, wins the tie."
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The Murrays' second serves.
That is where this one could be won and lost for Great Britain.
It is the weaker part of both Andy and Jamie's games and if Tsonga and Mahut can punish a few and get the jitters going in the Scot's serving arms, that could be vital.
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Quote Message: Jo-Wilfried Tsonga is unbeaten in five doubles matches in this format of the game for France, and I think they've put him in here to counter the big name of Andy Murray. from Peter Fleming BBC Sport
Jo-Wilfried Tsonga is unbeaten in five doubles matches in this format of the game for France, and I think they've put him in here to counter the big name of Andy Murray.
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The last time that Great Britain were in the last four of the Davis Cup was back in 1981 when a team that included big-serving Buster Mottram and current Wimbledon tournament referee Andrew Jarrett travelled to Christchurch to beat New Zealand.
It's been a while. But history is there to be made.
Last year's run to a quarter-final defeat by Italy was the first time Great Britain had been in the last eight since 1981.
This year, Belgium, Argentina and Kazakhstan are leading the other three quarter-finals. If Great Britain can beat France, there is a decent argument that they could beat any of those.
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Quote Message: No disrespect to Dom Inglot, but if Andy Murray strolls up to the captain at breakfast and says he is ready to play, then he plays. from Andrew Castle BBC Sport
No disrespect to Dom Inglot, but if Andy Murray strolls up to the captain at breakfast and says he is ready to play, then he plays.
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Great Britain troop out on court led by captain Leon Smith.
A rapturous response from the crowd, jacked up on sunshine and anticipation.
The on-court MC runs through the introductions.
"And last, but certainly not least, Andeeee Murrreee," he slur-shouts.
Murray responds with a sheepish wave.
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BBCCopyright: BBC
How is this for an omen?
Andy Murray has never lost a Davis Cup singles rubber on grass and has a 22-2 win loss overall in the singles side of the competition.
However his one and only appearance in the doubles was a defeat, going down to Israel's Jonathan Erlich and Andy Ram in five sets alongside Jamie Delgado in a Europe/Africa Relegation play-off in Eastbourne in 2006.
That year Britain narrowly avoided dropping into the doldrums of Europe/Africa Zone II alongside the likes of Monaco, Cyprus and Algeria.
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In honour of the Murrays trying to work as bit of Bryans-style magic, we are after your favourite sets of sporting siblings today.
And not just from tennis either.
Cricketing Aussies Steve and Mark Waugh? Come on down.
Cyclists Franck and Andy Schleck? You are in.
Footballers Jerome and Kevin-Prince Boateng? Welcome.
Use #bbctennis on Twitter, 81111 on text from UK phones and, of course, Facebook to send your nominations.
Live now
BBC Sport
BBC One
And we are go on BBC One.
Sue Barker is joined by Peter Fleming and Andrew Castle.
Just click on the live coverage tab on this page to get involved.
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Going for a Tsonga
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Davis Cup regulations allow team captains to shift their squad around within on hour of play starting.
And France captain Arnaud Clement has also shuffled his pack.
Richard Gasquet's elegant grass game has been ditched in favour of Jo-Wilfried Tsonga's jackhammer power. Tsonga slots in alongside Nicolas Mahut in the French combination.
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Oh yes.
Captain Leon Smith has played his wildcard. Out goes Dom Inglot - who took the Bryan brothers to five sets alongside Jamie Murray in the last round - and in comes Andy.
A big call. But is it a good call?
Murray junior is now locked into a schedule of three matches in three days. And he may have to win them all for Great Britain to progress.
Brother Act?
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One of Andy and Jamie Murray's first high-profile doubles appearance was in the short-lived Aberdeen Cup in 2005 when the brothers teamed up to help Scotland to victory over England.
Their most-recent outing together on the ATP Tour was back in March 2013, losing in the second round at Indian Wells to Treat Huey and Jerzy Janowicz.
Is today, with a potentially pivotal Davis Cup quarter-final doubles rubber on the line against the French, the day they get the band back together?
Live Reporting
Mike Henson
All times stated are UK
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Latest PostTomorrow
What a day in prospect tomorrow.
Andy Murray will open up the day's action against Gilles Simon, or perhaps Richard Gasquet.
With the best will in the world, I think everyone hopes that James Ward can bat around a dead rubber with Jo-Wilfried Tsonga in the day's second match.
We'll be here for it. Hope you will be too.
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Owain McLacey: Dunblane showing the tennis world how it's done! Well done to the Murrays
Rachel Crawford: That win was a thing of beauty.
Alana Bardill: Sensational! Well done @jamie_murray & @andy_murray. What a double act
Video highlights
That was like Super Saturday 2012.
You need to watch it again straight away, partly because you enjoyed it so much, partly because you believed it so little the first time round.
Good news. No need to wait for the DVD. You can watch highlights at the top of this page, picking out a pinball rally and the wild celebrations that accompanied the end of the third set.
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The nightmare of the Wimbledon men's doubles final last week is eradicated for Jamie Murray. He didn't play at his best there last week, but he has come out and performed today."
The Special Two
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James: What a great game by the Murray brothers! Bring on Sunday.
Janine Pingree: Congratulations to the awesome Murray brothers! That was a fantastic match.
Meredith Lawrence: Well done Murray Bros
Captain reaction
Captain Leon Smith: "How good was that? Everyone talked about this being a key rubber, and it certainly was. Of course there's a lot of tennis still to be played but we're in a great position. I'm immensely proud of the brothers, the chemistry between them was phenomenal. There's no egos in the team at all, everyone accepts the decisions.
"We all know each other so well, we spend a lot of time together throughout the whole year so we know how to speak to each other.
"It's a tough day tomorrow, no-one should assume it's going to be an easy game for Andy because it won't be."
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Sue Barker
BBC tennis presenter
"If you look at who are winning the other Davis Cup quarter-finals, whoever wins this tie is the favourite to win this cup."
Player reaction
Jamie Murray: "The crowd were amazing, twice as loud as yesterday. They cheered us from start to finish. We're in a good position to win the tie now."
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"I saw something new from Andy Murray today as a doubles player. He took the lead from his brother and they spurred each other on. There was no stopping them in the end and Andy is stepping up into that league where he can just dominate a whole weekend at the Davis Cup now."
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"This has been an advert for all that is good about British tennis but we must remember that this tie is not over yet by any means."
Player reaction
A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Andy Murray: "We played an unbelievably high level-match against a top team in a great atmosphere. To represent your country with your brother and to win a match like this is unbelievable.
"We both served well after the first game in which I was broken. We didn't give them too many opportunities. We kept a lot of energy on the court and returned really well. That made a big difference.
"It was not so much my groin as my hip. Everyone's fallen a few times on the court. It's sore but there's only one more match then I can rest after that.
"I'll get patched-up and hopefully put on another good performance They have such a strong team, you have to be at the top of your game to win."
Congrats from Down Under
Coach Darren Cahill adds his congratulations.
The winners of this tie will play either Cahill's native Australia or Kazakhstan in the next round
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray took 20 minutes to settle in at the start, but from that point on both he and Jamie were absolutely spectacular. The Brits were far superior in points won at the net and in the end it came back to that third set tie-break. How large a presence was Andy Murray?"
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Tom: Can we all take a moment to appreciate that Andy plays at all, let alone for 3 days straight after Wimbledon. Serbia no Djokovic. Canada without their best 2. Swiss had no Wawrinka or Fed last round.
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Jamie Murray and Andy Murray are interviewed courtside.
Andy hails their "really high-level tennis against a top team" and says that their returning was key to the win.
Jamie quips that he never imagined that they would represent GB together, saying "perhaps Andy, but not me!"
He adds that it hopefully puts GB "in a good position to win the tie" to wild cheers.
Full quotes to come.
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David Snelgrove: Never seen Andy Murray show so much emotion! Brilliant to see!! C'mon the Murrays
Paige Marie Roberts: And just when I thought my time jumping around the living room screaming about tennis was over....C'MON MURRAY BOYS!!
Helen Lagadu: Loving the Davis Cup tennis. Great atmosphere, cracking game to watch. It's stopping me doing my paperwork.
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Mahut and Tsonga are not hanging around to bask in the aftermath of this defeat.
They scurry off with racquet bags over their shoulders just as the MC wraps his vocal cords around the long vowels in "Muuurrrreeee".
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Mike Roebuck: Scots carrying GB over the line. I feel like I'm watching curling!
Sam Jamaa: I remember how the Davis Cup was the springboard for Djokovic's supremacy. Getting ahead of myself here, but here's hoping!
Robin Armstrong: Don't think I've ever seen Andy so fired up in my life. Team GB daring to dream of the semi finals of the Davis Cup?
Game, set and match
A Murray/J Murray 4-6 6-3 7-6 (7-5) 6-1 Tsonga/Mahut
Good news for a Brit
Take that! Jamie Murray wallops away the final smash to start the party.
He and Andy wrap each other in hearty embraces and face-wide grins.
GB save two break points
A Murray/*J Murray 4-6 6-3 7-6 (7-5) 5-1 Tsonga/Mahut
Massive from Jamie Murray as he answers every pinging Tsonga forehand with a volleyed reply as GB get back to 15-15.
But France work up 15-40 and two break points.
The first is save with a clattering first serve.
Andy Murray claims the second with a regulation volley after another great tee-off.
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A Murray/*J Murray 4-6 6-3 7-6 (7-5) 5-1 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"Jamie Murray with the slightly nerve-wracking honour of serving-out this match."
France hold
A Murray/J Murray* 4-6 6-3 7-6 (7-5) 5-0 Tsonga/Mahut
France cling on. But only by their fingernails.
Andy Murray flicks a backhand just wide and brother Jamie Murray with serve for the match next.
France taken to deuce
A Murray/J Murray 4-6 6-3 7-6 (7-5) 5-0 Tsonga*/Mahut
Andy Murray brings a tremendous rally to an end with a top-spinning cross-court pass that dips like a Roberto Carlos free-kick.
Deuce. Murrays both playing like men possessed and Britain two points away from the doubles rubber.
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Ian Rhodes: Andy Murray has got better and better as this match had gone on
Jane Stewart: Engrossing tennis, massive swing. But please, for the love of all things good, let's eradicate the phrase "virtual match points
Leigh: Great to see the Murray brothers so fired up! They have this rubber in the bag!
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 5-0 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The Murrays were off the pace in the first game of the first set, but since then they have been awesome. Their personality has shone through."
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A Murray*/J Murray 4-6 6-3 7-6 (7-5) 5-0 Tsonga*/Mahut
Andy Murray is GB's chief cheerleader as well as singles top-dog and doubles compadre. I think he would carry the water and drive the bus as well if asked.
He loves it when tennis throws off the smart-casual formalities and gets raw and raucous. That is how it is right now.
He holds to 15 and Tsonga is serving to stay in the rubber.
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Lucy Brown: Amazing atmosphere at the Davis cup makes me want to be there
Jordan Holt: #murraymania Leon Smith really sending his team places this year!
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A Murray*/J Murray 4-6 6-3 7-6 (7-5) 4-0 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The French are reeling right now. They need to do something quickly, or they are out of here because Andy Murray has become more and more comfortable as this match has gone on."
Britain break
*A Murray/J Murray 4-6 6-3 7-6 (7-5) 4-0 Tsonga/Mahut
Good news for a Brit
"Let's go, let's go!" implores Kim Sears as brother-in-law Jamie hammers a smash off stage left for 0-30.
Hubby Andy lunges in to pat away a volley for 0-40 and three break points.
Team Murray don't play another shot. Nicolas Mahut serves a double-fault that is doing nothing for negative national stereotypes
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 3-0 Tsonga/Mahut*
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"You can get a little tight and a little conservative in this situation when you are ahead, but it's important to try and relax and press home the advantage. Both teams are dealing well with this surface because it's like they are playing on ice at times."
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 3-0 Tsonga/Mahut*
One hold down. Three to go.
Jamie Murray booms down an ace to seal it and Jo-Wilfried Tsonga did not get anywhere near it with a half-hearted waft.
Tsonga took a tumble earlier it the game and looks thoroughly winded mentally as well as physically.
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Jamie: Don't want to jinx it, but #teammuzz look unstoppable at the moment
Ruth Corrigan: Allez Les Scotties!
Donna Richardson: What an awesome set loving the #DavisCup talk about passion!! Great atmosphere come on GB
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A Murray/*J Murray 4-6 6-3 7-6 (7-5) 2-0 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"The format of this Davis Cup tournament may not suit some of the players, or their agents, or for that matter their earning potential. But they love it because of atmospheres like this. It has to be said France are teetering on the brink at the moment."
Britain break
A Murray/J Murray* 4-6 6-3 7-6 (7-5) 2-0 Tsonga/Mahut
Good news for a Brit
Jo-Wilfried Tsonga tumbles, but can't get his racquet on the ball and keep it in play.
Andy Murray frothing with excitement, his French opponent downcast and the end possibly in sight.
Four more service holds and Britain are 2-1 up in the tie...
France save break point, but taken to deuce
A Murray/J Murray 4-6 6-3 7-6 (7-5) 1-0 Tsonga*/Mahut
A bit of controversy as Jo-Wilfried Tsonga's second serve is punished by Jamie Murray on the opening point.
France captain Arnaud Clement claims that Tsonga's failed attempt to scrape back a volley was affected by a rogue call of "out" from the crowd.
I doubt he was. Tsonga was a good 20m away and focused on the ball.
French rattled and they offer up a break point as Mahut blasts a regulation smash wide for 30-40.
Saved! But still deuce to work their way through...
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A Murray/J Murray 4-6 6-3 7-6 (7-5) 1-0 Tsonga*/Mahut
Jamie Murray with a delicious touch volley, feinting to hammer the ball and instead feathering it out of the reach of either Tsonga or Mahut.
Cheeky.
A solid hold to keep the mojo with the boys in darker blue.
GB win third set
A Murray/J Murray 4-6 6-3 7-6 (7-5) Tsonga/Mahut
Tim Henman
Former British number one on Radio 5 live
"It shows how much it means to Andy Murray to be on the court with his brother with a full house playing for his country.
"When you see this atmosphere it's great. It can only help the game."
GB win set
*A Murray/J Murray 4-6 6-3 7-6 (7-5) 0-0 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Jamie Murray does not have a classical style by any means, but boy does he make it work as Britain take the crucial third set. Some picture-perfect returns in that tie-breaker. This is fun!"
GB win third set
*A Murray/J Murray 4-6 6-3 7-6 (7-5) Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"What a wonderful set of tennis. It's uphill for the French from here. This has been a fantastic comeback by these brothers."
GB win third set
A Murray/J Murray 4-6 6-3 7-6 (7-5) Tsonga/Mahut
Russell Fuller
BBC tennis correspondent at Queen's Club
"Andy Murray is still going for it like mad on the team bench but Jamie Murray is a figure of calm in comparison."
GB win third set
A Murray/J Murray 4-6 6-3 7-6 (7-5) Tsonga/Mahut
Miles Maclagan
Former coach to Andy Murray and Laura Robson on BBC Radio 5 live
"How much did that mean to Andy Murray? That's a huge third set under the belt and the momentum is with GB."
Game and third set GB
A Murray/J Murray 4-6 6-3 7-6 (7-5) Tsonga/Mahut
Gotcha!
Andy Murray's return forces Tsonga to volley long and Queen's explodes upwards.
Britain need just one of the next two sets. Leon Smith likes those maths, standing back to applaud the Murrays after Andy eventually stops bouncing and starts sitting.
Tie-break
A Murray/J Murray 4-6 6-3 6-6 (6-5) Tsonga*/Mahut
France have a mini-break back as Jamie Murray slips on the stretch out wide. Andy Murray revives the mood as he slaps away. Back on serve, but set-point Britain...
Tie-break
A Murray/J Murray* 4-6 6-3 6-6 (5-4) Tsonga/Mahut
Mini-break Britain! A brilliant dipping return from Jamie, a precise pair of volleys from Andy and GB are two points away from the set...
Tie-break
A Murray/J Murray 4-6 6-3 6-6 ( 4-3) Tsonga/Mahut*
Two pinpoint, laser-guided bombs off the Andy Murray racquet and his serve is safe and sound. Over to you Monsieur Mahut...
Tie-break
*A Murray/J Murray 4-6 6-3 6-6 (2-3) Tsonga/Mahut
Jamie Murray holds serve, before Tsonga crashes down a 131mph ace to keep us on level pegging.
A Jamie return long down the line and France are ahead for the first time in the breaker. Andy to serve...
Tie-break
A Murray/J Murray* 4-6 6-3 6-6 ( 1-1) Tsonga/Mahut
A mini-break on the very first point for Britain as Jamie Murray snaps in.
But Jo-Wilfried Tsonga grabs it right back with a dipping return on to Jamie's toes.
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A Murray/J Murray 4-6 6-3 6-6 Tsonga/Mahut*
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Once again, some solid first serves there from Andy which Tsonga just couldn't re-direct. He looks to have recovered quickly from his fall. Crisis mode health-wise over now."
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A Murray/J Murray 4-6 6-3 6-6 Tsonga*/Mahut
Maybe the hip flexor, inner groin or whatever it was that Murray hurt in the last game is like an appendix or your tonsils.
Nice to have, but more decoration than an essential component.
Andy launches down a ram-jammer of an ace to kick the game off and keeps serving massive to take us into a tie-break.
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Ian Rhodes: Fine piece of sportsmanship from @tsonga7 he was the first to go over to see if murray is ok
Sachin Patel: Never seen the crowd at Queens Club like this, a proper Davis Cup atmosphere
Jackie Grant: Get the Proclaimers on!
Andy Murray returns to action
*A Murray/J Murray 4-6 6-3 5-6 Tsonga/Mahut
Andy Murray is back on the dancefloor.
He does not look the full ticket though as France polish off the final point of the game as it restarts at 40-15 up.
And it is Andy Murray to serve next.
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Piers Newbery
BBC Sport at Queen's Club
"Shane Annun takes centre stage, Murray's fitness trainer who has been in place since last year and to whom the Scot has paid glowing tribute in recent weeks. The worry, even if he recovers, is that Murray will have to take on Gasquet or Simon tomorrow. "Get up, stand up," booms Bob Marley over the PA. Bit harsh."
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A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
Andrew Castle
BBC tennis commentator
"The French wouldn't wish an injury on anyone, but this is clearly potentially a big boost for their chances. A British team without Andy Murray is clearly a different proposition to one with him in."
Andy Murray receives treatment
Bad news for a Brit
I'll be honest with you. It does not look good.
Andy Murray is still clasping his hand across his face, breaking off only to grimace.
The DJ is keeping it light-hearted, firing up Bob Marley to instruct Britain's top dog to "get up, stand up, don't give up the fight."
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A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The physio just testing Andy out now to see what kind of strength he has in those muscles. Once he has identified what the issue is, he has three minutes in which to treat it.
"The incident happened when he was taken far out of court where the grass is so green, he had no chance for any traction whatsoever."
Andy Murray receives treatment
A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
This could be the whole match and a historic place in the Davis Cup last four resting on a tiny bit of tendon.
The trainer is on to work on Andy Murray. He has three minutes to produce a little magic.
What have you got medicine man?
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A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
Andrew Castle
BBC tennis commentator
"Andy Murray looks in some trouble back there, certainly the noise wasn't good. Is it a hip flexor? We don't know at this stage. 'I told you about this' he says as he walks to the sideline. If it's popped, it's popped."
Andy Murray injures left leg
A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
Bad news for a Brit
Uh-oh.
Andy Murray has taken a heavy fall out wide as he chases down a Tsonga smash.
He went down with a squeal and has come up clutching his groin.
He limps to the courtside seat for treatment.
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A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
Andrew Castle
BBC tennis commentator
"It's so tight. You feel as though the whole result of this match now rests on the outcome of this third set."
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A Murray/J Murray 4-6 6-3 5-5 Tsonga*/Mahut
I like what you have done there.
With their men looking safe at 40-0 up, the British hardcore, clad all in red, unveil a re-working of the football chant dedicated to the Toure brothers.
All together now. "Andy, Andy, Andy, Andy, Andy, Andy, Andy Murray. Jamie, Jamie..."
It works better out loud than in text.
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Colin Drennan: Good to see Jamie Murray getting credit for how great a player he is.
Jenny Jean-Paul: AC/DC and tennis. Now that's what I'm talking about.
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A Murray/J Murray* 4-6 6-3 4-5 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"What a great atmosphere and an interesting choice of music at breaks in between games. I'm sure the Queen's Club hasn't had AC/DC playing out here too often in its history."
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A Murray/J Murray* 4-6 6-3 4-5 Tsonga/Mahut
Nicolas Mahut rattles through a service game to love.
The French fans are getting boisterous. Jamie Murray to try and pour a little cold water on them next.
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A Murray/J Murray 4-6 6-3 4-4 Tsonga/Mahut*
This set is gaining weight faster than a tourist in Texas.
Andy Murray breezes through a service game with Jo-Wilfried Tsonga wastefully blasting long on a second-serve return at 30-15 down.
We are heading into the business end of things. No margin for error. The winner of this one will be two-thirds of the way home.
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*A Murray/J Murray 4-6 6-3 3-4 Tsonga/Mahut
Jo-Wilfried Tsonga challenges a call against his attempted second-serve ace. That was very optimistic. It was out by a handle's length.
Forty-thirty and a glimmer for Great Britain.
But Jo-Wilfried snuffs out the hope with a slugged serve out wide. No need to call for the virtual replay gods. That was a squeaky clean ace.
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A Murray/J Murray 4-6 6-3 3-3 Tsonga*/Mahut
Andrew Castle
BBC tennis commentator
"France has a wonderful heritage in tennis. They have to 10 players ranked in the top 100 in the world at present, and if teams were made up of five men in this competition they would be strong favourites to win the lot."
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A Murray/J Murray 4-6 6-3 3-3 Tsonga*/Mahut
Some canny and careful volleying from Andy Murray - keeping the ball right on Nicolas Mahut's toes to deny him any angle for a winner - is the highlight of a whistlestop hold to love.
France hold serve
A Murray/*J Murray 4-6 6-3 2-3 Tsonga/Mahut
Andy Murray would be rubbish at poker. Every emotion is at the surface.
He screams abuse at himself and replays the stroke at a furious pace as he duffs a return into the net to hand over the game.
The DJ fires up Lady Marmalade, complete with the chorus repeated by every schoolboy day-tripper to France.
France taken to deuce
A Murray/J Murray 4-6 6-3 2-2 Tsonga/Mahut*
The French have been pretty much impeccable on serve so far and Nicolas Mahut looks to be cruising at 40-15.
But Mahut volleys wide for 40-30, before Jamie Murray somehow manages to lay string on the ball as it is blasted at him to take the game to deuce.
A chance for Britain...
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A Murray/J Murray 4-6 6-3 2-2 Tsonga/Mahut*
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray's service has been under pressure in recent games, but he's come through with flying colours and for me this is where the match turns if the Brits can just put a couple of good returns in."
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Ben Cookson: Are the female tennis players not involved at all in the Davis Cup? Or do they have a similar tournament ?
Rachael Collins: Why is Tsonga's top a different shade of blue to the rest of his team?
Martin Hotchkiss: Funny how the players don't need to towel their faces every point in doubles.
Ben - Fed Cup
Rachael - Individual sponsors
Martin - Too much fist-jabbing to be done
GB taken to deuce but hold
A Murray/J Murray 4-6 6-3 2-2 Tsonga/Mahut*
These French boys can do some retrieving.
Tsonga and Mahut are back with the line judges fishing back smashes before Jamie Murray finds the killer angle.
Tsonga's forehand fire takes the away side on to 30-30, before a brave second serve from Andy Murray - hard and wide - stretches Mahut out of shape.
Jamie Murray caught in two minds at the net whether to leave it or volley away a winner and does neither. Deuce.
But Andy Murray digs out twin brutes of serves to see off the danger.
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Golfer Justin Rose is backing the Brits from his sofa in St Andrews. He's got time on his hands after all with the third round of the Open delayed until Sunday now.
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*A Murray/J Murray 4-6 6-3 1-2 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"People have questioned why Gasquet isn't playing for France, but the tie is a long way from over yet. Keep your power dry on criticising the French just yet."
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James Matthews: I reckon Andy Murray has a live twitter feed in his ear when he plays - he performs best when naysayers appear.
Fay Partridge: Why didn't I get tickets for the Davis Cup!? I wanna see Jamie & Andy.
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*A Murray/J Murray 4-6 6-3 1-2 Tsonga/Mahut
Russell Fuller
BBC tennis correspondent at Queen's Club
"I've just been down to the GB bench and the vibe was pretty excitable. There's real belief that this doubles rubber can be won.
"The other thing that struck me was what a fantastic view those in the front rows have. They are so close to the action they can see the players' emotions and almost hear what they are saying."
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*A Murray/J Murray 4-6 6-3 1-2 Tsonga/Mahut
Great Britain are still yet to win a point on the Tsonga/Mahut serve in this third set.
The changeover DJ has a licence to roam around his back catalogue. He puts on an incongruous slice of Rihanna to accompany the pat-down and rehydration session.
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A Murray/J Murray 4-6 6-3 1-1 *Tsonga/Mahut
Andy Murray on net duty while brother Jamie gets the rallies started from the back of the court.
The world number three's volleying is looking very sharp. Tsonga and Mahut's fetching is giving him plenty of practice, but Andy's overheads and angles are keeping them permanently on the back foot.
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A Murray/*J Murray 4-6 6-3 0-1 Tsonga/Mahut
Piers Newbery
BBC Sport at Queen's Club
The sound of The Proclaimers has come to mean Britain's Davis Cup hopes are on the rise, and it's Jamie Murray who is leading the way today.
While Andy has taken a while to reacquaint himself with the angles and dimensions of a doubles court, Jamie has been in Grand Slam final form. LTA chief Michael Downey is beaming courtside, the Canadian sportingly wearing a Union Jack covered jacket.
Player reaction after GB win second set
Britain's James Ward on BBC One: "The French didn't miss a ball in the first set, but the boys have bounced back well and now it's looking good."
Britain's Dom Inglot: "It doesn't matter in what capacity you are, you are part of the squad and I'm just happy to be here.
"I'm hoping for a 3-1 win for us. Andy missed a few first serves early on but you can see the bond with Jamie and they look more dangerous on the return than the French. I think there's even more to come."
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A Murray/*J Murray 4-6 6-3 0-1 Tsonga/Mahut
That was a punchy little service game from Nicolas Mahut. A game that says the fight is far from over.
The Frenchman puts away a deft volley, finding the angle past Jamie Murray and down the line.
Two big serves follow with flailing returns dribbling into the net as France hold to love.
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A Murray/J Murray 4-6 6-3 Tsonga/Mahut*
Andrew Castle
BBC tennis commentator
"The Murray brothers have bounced back and both teams need to re-group for the start of the third set. Queen's Club is now officially a little piece of Scotland."
Game and second set
A Murray/J Murray 4-6 6-3 Tsonga/Mahut*
Jamie Murray practically barges brother Andy out of the way to crash away a volley for 30-15.
Andy with the judgement of Solomon as he shoulders arms to allow Tsonga's forehand to fly past him and the net and a couple of inches long at the back of the court.
Nicolas Mahut fails to claw a final serve out of his ribs and the second set is Great Britain's.
Cue the Proclaimers.
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A Murray/J Murray* 4-6 5-3 Tsonga/Mahut
It could have been an early end. As it is Great Britain, and Jamie Murray in particular, will have to do it with the ball up their end of the court.
France are teetering at 0-30 before Jo-Wilfried Tsonga plucks three monster serves out off the rack.
Nicolas Mahut seals the game with a bulleted smash straight at Jamie after a dolly of a lob from Andy.
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Miles Maclagan
Former coach to Andy Murray and Laura Robson on BBC Radio 5 live
"Jamie Murray is incredibly sharp at the net and he's making the right decision in which way to move to anticipate the return."
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A Murray/J Murray 4-6 5-2 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"If the Murrays played together in Grand Slam doubles, they would be a threat without a doubt. But I think those days are over due to the physical demands of singles these days and the schedule Andy faces with that."
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A Murray/J Murray 4-6 5-2 *Tsonga/Mahut
A smart return from Jo-Wilfried Tsonga out-foxes and wrong-foots Jamie Murray at the net to pull the French back to 30-30 from 30-0 down.
Too much power on the next Andy serve though for Nicolas Mahut. His stroke is not anything more than a block, but the ball floats long.
Jamie gobbles up another Tsonga return, cracking the ball away onto Mahut's toes to seal the game.
Andy bounces off court like Zebedee.
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Tom Sanford: What an atmosphere inside Queen's for the tennis, come on Andy and Jamie!!!
Colin Livingstone: Am I right in hearing the Davis Cup crowd chanting England, England as the Murray brothers play?
Nadine Erskine: The atmosphere looks incredible. Wish I was there!
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*A Murray/J Murray 4-6 4-2 Tsonga/Mahut
Nicolas Mahut steadies a rocking French ship with a service hold.
The wind is in the home sails though.
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Tony Cocozza: Leon Smith places far too much emphasis on Andy Murray. Awful decision to break up a settled doubles team. Smith is blinkered.
I think Tony may have revised his opinion over the last couple of minutes.
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A Murray/J Murray 4-6 4-1 Tsonga/Mahut*
Andrew Castle
BBC tennis commentator
"That's a solid service hold, and Dunblane's finest have a 4-1 lead in the second set."
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A Murray/J Murray 4-6 4-1 Tsonga/Mahut*
And a hold to love from Jamie Murray to back up the break.
Jamie is punching air like a frenzied cagefighter going for the kill. The crowd are buzzing like it is last night of the Proms.
Rule Britannia. France looking like the sick man of Europe.
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A Murray/*J Murray 4-6 3-1 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray is slowly making the change from playing regulation doubles to Andy Murray doubles, and its effects are showing on the scoreboard."
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GB breaks
A Murray/J Murray* 4-6 3-1 Tsonga/Mahut
On return, Andy Murray takes on Nicolas Mahut at the net, thumping low and hard across court and clearing the wire by only a whisker.
Mahut's volley is snaffled by the net. Thirty-all.
Brilliant by Andy Murray as he reacts like lightning to scoop a ball back and Mahut crashes a regulation forehand into the net.
Break point. A ball floats towards the British baseline. Murray watches it land and immediately calls for a Hawk-Eye review.
He looks like he has concerns. But it is long!
Britain have broken. Glory be!
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A Murray/J Murray 4-6 2-1 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"It's a sensible tactic from the Brits, bringing Tsonga's backhand into play if at all possible like they are doing. It just takes a few service holds allied with this crowd, and the French might just start to feel a bit claustrophobic"
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A Murray/J Murray 4-6 2-1 Tsonga*/Mahut
A commanding game for Great Murray as they do away with the French to love via a thumped smash from Andy, an angled volley from Jamie and a fluffed backhand from Jo-Wilfried Tsonga at the other end.
A good start to this set for the home duo.
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*A Murray/J Murray 4-6 1-1 Tsonga/Mahut
Kim Sears is the first winner of the day.
Mrs Andy Murray has claimed a moral victory in her daily game of hide and seek with the cameras. It has taken until early in the second set before she is picked out of the crowd and appears on our screens sporting some big shades.
Nothing for her husband and brother-in-law in that game. A hold to love for Mahut.
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Ben: Huge risk bringing Andy into doubles. Jamie looks far more secure. Why break up proven pairing? Andy Murray plays three consecutive days too.
Ian: A mistake to pick Andy Murray. Dom Inglot, a doubles specialist, should be playing and he has a big serve. Wrong call by Leon Smith.
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A Murray/J Murray 4-6 1-0 Tsonga*/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Serving first again in this second set, Britain need a series of good solid holds here to put some scoreboard pressure on the French. That first game was a good sign."
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A Murray/ J Murray 4-6 1-0 Tsonga/Mahut*
Jamie Murray has a quick conflab with Andy as Allez les Bleus rings out and 15-30 pops up on the scoreboard.
A brilliant pick-up from Jamie and patted winner down the middle from Andy wins the next point, before Mahut's attempted lob drifts long under the concerned gaze of the Brits.
But there is still deuce to deal with...
And there is a familiar Scottish growl. Andy Murray hammers away a volley to close out.
A sweaty, but ultimately successful service game.
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Cammy Renwick: Would be interesting to know what Queen's Club members make of this crowd! Not your usual Moet brigade!
David Miller: We've missed a trick psychologically. Should have told French they can't play in blue like our boys. Home team choice!
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A Murray/*J Murray 4-6 0-0 Tsonga/Mahut
Miles Maclagan
Former coach to Andy Murray and Laura Robson on BBC Radio 5 live
"France have been almost faultless. They came out with great enthusiasm and energy, got the early break and have played with a lot of power."
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A Murray/*J Murray 4-6 0-0 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"The Blues in this part of London, well it is often Chelsea. But this time it's Les Bleus of France who are here and they have taken the first set. To win three of the next four sets against these two is going to be difficult for the Brits."
France win first set
A Murray/ J Murray* 4-6 Tsonga/Mahut
Jo-Wilfried Tsonga overcooks a volley on the stretch and Great Britain have 15-15. Big Jo-Willy is chuntering to himself and I think it is something strong than "zut alors".
Nicolas Mahut has been right on point though and a sharp volley wins the next point before he hammers a smash into row Z via the Queen's Club turf to seal the set.
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A Murray/ J Murray 4-5 Tsonga*/Mahut
France will have to serve for the set.
Andy Murray's serve is locked down tight. And Great Britain have a chance for a bit of a brainstorm before Tsonga tries to close out the opener.
Leon Smith is on court during the changeover giving his men a few pointers.
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A Murray*/ J Murray 3-5 Tsonga/Mahut
Andrew Castle
BBC tennis commentator
"Give some credit to the French pair, they are serving really well to Andy Murray so far."
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*A Murray/J Murray 3-5 Tsonga/Mahut
Andy Murray will be giving the Queen's groundsman the cold shoulder if they pass in a clubhouse corridor later.
A dirty old bounce on the baseline - the ball scooting on at him like a Shane Warne flipper - messes up his backhand with Mahut and Tsonga vulnerable at the net and 30-15 on the board.
France hold.
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A Murray/ J Murray 3-4 Tsonga/Mahut*
Russell Fuller
BBC tennis correspondent at Queen's Club
"Tsonga has been the outstanding player so far. He has played a fair bit of doubles, more than your average ATP Tour player, especially over the last 18 months.
"And he had a win with Gael Monfils, beating Jamie Murray and his regular partner John Peers in Monte Carlo earlier this year."
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A Murray/ J Murray 3-4 Tsonga/Mahut*
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy plays so little doubles, Jamie needs to take control and make him feel comfortable so he feels at his best. Only by doing that they will put fear into the French pair."
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A Murray/ J Murray 3-4 Tsonga/Mahut*
The Great Britain and France ultras have been seated dangerously close to each other.
The steward will have to intervene if artisan loaves and two pound coins start flying between the two sets of hardcore fans in this swish part of West London.
It is the GB section who have bragging rights as Jamie Murray cranks down a whopper of a serve to hold to 30.
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A Murray/ *J Murray 2-4 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Tsonga happy to roll the dice. He's going for it on second serve so clearly doesn't mind taking risks. It's worth the occasional double fault."
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A Murray/J Murray* 2-4 Tsonga/Mahut
Jamie Murray cracks away a volley and Great Britain have 15-30 and the first real sniff of a break.
But it is whipped away before their very eyes.
Jo-Wilfried Tsonga powers a serve out wide at 30-30. Jamie says it was good. Andy want to challenge. The umpire doesn't know which of the British brothers is in charge.
Andy gets his way. But he should have listened to his older brother. It was in by a fair stretch and France have blasted clear of a slightly sticky situation.
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Sporting siblings
Ed, Exeter: My personal favourites, Joe Cole and Andy Cole.
And, of course, their cousin Ashley. And musical great uncle Nat King.
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A Murray/J Murray 2-3 *Tsonga/Mahut
An Andy Murray double-fault sows a few seeds of doubt and brings up 15-15.
But he calls rank on Jamie to hit an overhead and then targets Tsonga with a flurry of volleys. The Frenchman eventually coughs up an ugly stroke that flops into the top of the net.
Game sealed.
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Murray*/Murray 1-3 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"The Murrays are trying to expose Tsonga, they think his doubles instincts are a little rusty but the French look good so far."
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*A Murray/J Murray 1-3 Tsonga/Mahut
Nicolas Mahut's serve, albeit it with help from John Isner's iffy returning, was one half of the longest match in Wimbledon history.
His tee-off looks in decent nick as France ramp up to 40-0.
Jamie Murray keeps cool, crashing away an overhead to bring back 40-30.
But it is too much of a gap to make up.
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A Murray/J Murray 1-2 Tsonga/Mahut*
It is getting noisy at Queen's.
And not just between points.
Andy and Jamie Murray have a decent length of dialogue over who will put racquet on a Tsonga lob, before Andy wins the argument and takes charge.
Jamie nets a volley on the next shot though and France have 15-30.
The Murrays knuckle down to see off the danger, but they have been under the cosh in the first three games. Time for captain Leon Smith to earn his changeover corn with some words of wisdom.
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A Murray/J Murray* 0-2 Tsonga/Mahut
Peter Fleming
Seven-time Grand Slam doubles winner on BBC TV
"Andy Murray has looked a bit tight to me early on, and he has not stuck away any volleys so far but that will change."
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A Murray/J Murray* 0-2 Tsonga/Mahut
Jo-Wilfried Tsonga trundles the heavy artillery up to the baseline and his big serves help France to 40-0.
Better from Great Murray as Andy gets a return to dip on Tsonga's toe and Jamie swats away a volley.
But that is all they are getting from that game.
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Sporting siblings
Ken Canty: How about the Charlton brothers? 1966 World Cup winners. Can't think of any other World Cup winning brothers?
Tsonga/Mahut break
Murray/Murray 0-1 Tsonga*/Mahut
Nicolas Mahut crushes a return, Jo-Wilfried Tsonga cannons another cross-court for a winner and France have 0-30.
Nervy times and the balls are barely out of can.
Dazzlingly quick reflexes from Jamie Murray at the net help Great Britain back to 30-30.
But Tsonga is swinging for home-run winners and Andy Murray does not look like he has quite got to grips with the crowded court.
A duffed volley off the frame of Andy's racquet hands the early break to France.
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Andy Murray to serve first.
The crowd finally settle and we are ready...
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Piers Newbery
BBC Sport at Queen's Club
"They don't look so good together," says a French journalist after watching Tsonga and Mahut warm-up. Apparently the pair have never trained together so much and it appears they were always in the plans of captain Arnaud Clement.
"There is some level of surprise from the French press room that the big serve of Dom Inglot will not be used, but the Londoner has hardly played recently due to injury, while Jamie Murray arrives off the back of a first Grand Slam men's doubles final.
"After all the intrigue and speculation, it could just come down to nerve. "You know this is the final," says our French friend. "Who wins the doubles, wins the tie."
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The Murrays' second serves.
That is where this one could be won and lost for Great Britain.
It is the weaker part of both Andy and Jamie's games and if Tsonga and Mahut can punish a few and get the jitters going in the Scot's serving arms, that could be vital.
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The last time that Great Britain were in the last four of the Davis Cup was back in 1981 when a team that included big-serving Buster Mottram and current Wimbledon tournament referee Andrew Jarrett travelled to Christchurch to beat New Zealand.
It's been a while. But history is there to be made.
Last year's run to a quarter-final defeat by Italy was the first time Great Britain had been in the last eight since 1981.
This year, Belgium, Argentina and Kazakhstan are leading the other three quarter-finals. If Great Britain can beat France, there is a decent argument that they could beat any of those.
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Great Britain troop out on court led by captain Leon Smith.
A rapturous response from the crowd, jacked up on sunshine and anticipation.
The on-court MC runs through the introductions.
"And last, but certainly not least, Andeeee Murrreee," he slur-shouts.
Murray responds with a sheepish wave.
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How is this for an omen?
Andy Murray has never lost a Davis Cup singles rubber on grass and has a 22-2 win loss overall in the singles side of the competition.
However his one and only appearance in the doubles was a defeat, going down to Israel's Jonathan Erlich and Andy Ram in five sets alongside Jamie Delgado in a Europe/Africa Relegation play-off in Eastbourne in 2006.
That year Britain narrowly avoided dropping into the doldrums of Europe/Africa Zone II alongside the likes of Monaco, Cyprus and Algeria.
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In honour of the Murrays trying to work as bit of Bryans-style magic, we are after your favourite sets of sporting siblings today.
And not just from tennis either.
Cricketing Aussies Steve and Mark Waugh? Come on down.
Cyclists Franck and Andy Schleck? You are in.
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Going for a Tsonga
Davis Cup regulations allow team captains to shift their squad around within on hour of play starting.
And France captain Arnaud Clement has also shuffled his pack.
Richard Gasquet's elegant grass game has been ditched in favour of Jo-Wilfried Tsonga's jackhammer power. Tsonga slots in alongside Nicolas Mahut in the French combination.
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Oh yes.
Captain Leon Smith has played his wildcard. Out goes Dom Inglot - who took the Bryan brothers to five sets alongside Jamie Murray in the last round - and in comes Andy.
A big call. But is it a good call?
Murray junior is now locked into a schedule of three matches in three days. And he may have to win them all for Great Britain to progress.
Brother Act?
One of Andy and Jamie Murray's first high-profile doubles appearance was in the short-lived Aberdeen Cup in 2005 when the brothers teamed up to help Scotland to victory over England.
Their most-recent outing together on the ATP Tour was back in March 2013, losing in the second round at Indian Wells to Treat Huey and Jerzy Janowicz.
Is today, with a potentially pivotal Davis Cup quarter-final doubles rubber on the line against the French, the day they get the band back together?