Time for us to disappear into the night. But before we do, let's whet your appetite for tomorrow's action. Here are the scores on the doors...

Image source, #bbctennis

Join us again from 17:00 GMT to see if Britain can nab that decisive rubber. Cheerio!

Great Britain and Canada already know the prize at stake - a trip to France in the Davis Cup quarter-finals.

The French won their tie against Japan, who were without Kei Nishikori, with a day to spare after Nicolas Mahut and Pierre-Hugues Herbert won the doubles to give them an unassailable 3-0 lead.

A win for either Dan Evans or Kyle Edmund tomorrow gives the French chance of revenge for that memorable beating at Queens in 2015.

Image source, EPA

Jamie Baker
Former GB Davis Cup player on BBC Two

Regardless of Vasek Pospisil's injury, that doubles match was always going to be crucial in having a bearing on tomorrow's matches. The chances of Pospisil beating Dan Evans are much slimmer now. 

You will see Evans get into face of Pospisil, use his variety well and pummel his backhand. That's by far the Canadian's weakest side.

Great Britain's Jamie Murray on BBC Two: "Both teams knew how important this match was. It was 50/50 going into the match, we knew it would be a close game because of the surface and because we all know how to play doubles.

"We're really happy to win the point and we have given our guys two bites of the cherry tomorrow.

"As the match went on we started the points better and I think they got a bit tired as well. The surface was not easy, it was hard on the joints, but Vasek played yesterday and Daniel is getting older, so there was no excuse for us not to outlast them."

As we've been telling you, and the match stats prove, there wasn't much between those two pairs...

Image source, #bbctennis

John Lloyd
Former GB Davis Cup captain on BBC Two

I thought Dom Inglot was the best player on the court over four sets and Jamie Murray backed him up superbly. That was a big match for Inglot to come through in a pressure situation, and I thought he was the class act in the match. He’s been so desperate to get out on the court but he’s had to wait because Andy Murray was playing – and Dom knew that was the right thing to do. But he’s showed he is ready. If Andy plays a long match in a tie and is fatigued, we have a player who can step in without hesitation.

Image source, AFP

Jamie Baker
Former GB Davis Cup player on BBC Two

It wasn't the most amazing tennis to watch because there were not many rallies. But a lot of the tiebreaks were funny, they were very one-sided. Whoever got the upper hand early went on to win.

Firm handshakes and man hugs all around the British camp. And plenty of swaying from the singing Barmy Army. Celebration time. 

Daniel Nestor is tasked with keeping Canada in this match. He wallops a first serve against the back of Pospisil's head. I'm sure that wasn't because his chum choked in the previous game. 

The British boys are cooking on gas now, an Inglot winner down the line is followed by a close-range Murray effort for a 15-30 lead.

Canada haul themselves level though, then go 40-30 ahead when Murray skews a baseline return in the net. And Nestor spanks an ace down the 'T' to hold.

Over to Dom Inglot....

Swiiiiiing! That's the sound of momentum shifting firmly towards the British pair. Vasek Pospisil's head is in the washing machine, a shank off the rim of his racquet nearly spelling the end of his weapon's life. He tries to compose himself but the British pair are in no mood now to let him and Nestor off the hook.

A hold to 15 and the Brits are one game away from victory.

Britain have got...to go again. The whole arena thinks the Brits are going to take break point #1 when Inglot goes down the line, only for Pospisil to rummage in the top drawer and pull out a stunning crosscourt half volley that dust the far sideline.

0-40 becomes 30-40, but Murray and Inglot hold their nerve as Pospisil buckles again at the crucial time. Breakthrough!

Image source, AFP

Vasek Pospisil's mind needs a massage. He double faults for 0-15, then slams a decent Inglot return into the net for 0-30. The Brits ramp up the pressure, another Inglot volley palmed into the net by Pospisil. Three break points...

Canada captain Martin Laurendeau turns physio again at the changeover, tending to Pospisil's knee. I hope he's getting paid two salaries for tonight.

Pospisil pounces at the net to raise Canadian hopes at 0-15, Inglot extinguishing them with a gentle half-volley. Good hands for a big man.

Jamie Murray does what he does best, hammering away a couple of net volleys, to give the Brits breathing space at 40-15.

And he pulls out his favoured shot again - a backhand, cross-court volley - to seal the hold.

Image source, AFP

Nestor, socks still firmly pulled up to the knees, sends down some swinging left-handers to move 30-0 clear, and it's another simple hold. Serve very much in charge again as everyone seems to be taking a breather.

Pospisil necks a couple of pills between games.

John Lloyd
Former GB Davis Cup captain on BBC Two

It is tough to see, although we don't know how bad his injury is, how Pospisil can come out tomorrow and beat Dan Evans.

A few jitters as Murray drops the first point but Inglot clambers all over the net to get the initiative back, and then angles away a backhand volley to see out the game to 30.

Time for another rubdown on the Pospisil thigh...

All the energy is on the British side of the net right now but Canada do well to hang on as the visitors buzz around the net, looking for openings. Nestor closes out the game with a gentle flick of his wrist on a forehand volley.

A solid start to the fourth set for Britain, with Inglot thumping down a heavy serve for a love hold. Time for a quick chinwag with captain Smith on the changeover, then back to it...

Image source, AFP