...out of nowhere Isner forces deuce. Well, I say out of nowhere...largely thanks to Murray inexplicably double-faulting at 40-30. Murray's service winner is met by a call for himself to 'Fire up' - which is curiously met by a few boos from the Paris crowd. It works though, Murray slamming down another sizzling serve which Isner can't control.

Image source, AFP/GETTY

"Ooooh! Aaaah!" The excitement levels inside Lenglen reach rollercoaster-style proportions as Andy Murray scrambles across the baseline, somehow keeping the second point alive. In the middle of all that drama, Isner mashes a forehand long - much to his own disbelief. Murray's 30-15 lead quickly becomes 40-15 with a crunching backhand. And then...

Isner is looking as miserable as the Paris skies. He knows he blew a golden chance in that first set. With body language similar to a child who has just been told he is grounded for a week, Isner sloppily allows Murray to lead 15-0. But the American - almost semi-consciously - pulls out his biggest weapon, an ace. That kicks him into life and a hold.

Image source, Reuters

No sign of any imminent rain. Let's crack on. Murray to open the second set, which he does with relative ease. The British number one holds to 15, now can he chip away at Isner? 

*denotes next server

Mike Dickson
Daily Mail tennis correspondent on BBC Radio 5 live sports extra

"The backhand when Murray was facing his first set point was the key for me. It was extremely tough to execute but he did it superbly.

"The match is not over yet because Isner is really playing well. Isner served as we expected but he's playing well from the back too.

"However, he's thrown the kitchen sink at Murray but is still a set down. Can he play any better than that? I would doubt it."

Wow. Time to catch your breath back. Although let's be careful what we wish for....huge dark clouds are dominating the Parisian skyline. Anyone up for a rain dance?

Isner to serve, Murray has another break opportunity...

He's got it! Isner shuffles along for an inside forehand - he doesn't trust his backhand - and that finds the tramlines. A huge roar from Murray! That's what you call digging deep.

Image source, Reuters

Mike Dickson
Daily Mail tennis correspondent on BBC Radio 5 live sports extra

"Isner is causing Murray all kinds of problems. Murray has made a couple of errors but that's because he's being put under intense pressure."

Murray serve...down the middle..Isner can't get it back...

Murray holds after targeting the Isner backhand. This is epic. A quick changeover, allowing the fans to leap into a quick Mexican wave.

Isner holds with a forehand volley. On we go. Back to Murray's serve...

Image source, Getty Images

Oh my word! Is anyone going to win this tie-breaker?! Murray misses a chance - and he knows it. The Briton looks skywards and growls.

Back to Murray's serve...tense. The Briton keeps his nerve - and his serve. Now he has a set point...

Image source, Getty Images

The pendulum swings back to Isner. A rogue backhand from Muzza gives him another set point...

Sensational! Murray buries a brilliant backhand winner past Isner's despairing dive. "Come onnnnn!" shouts the Briton. Isner should have put the forehand away. Error.

Image source, AP

Unbelievable. Isner has a chance to serve for the first set. Murray, perhaps distracted by umbrellas going up, wallops another forehand out of the court...

Right then Murray. Two holds to win this first set...

Oh no! The first one goes begging, Murray totally overcooking a simple forehand.

Image source, Reuters

Impressive. Isner keeps his nerve, holding both of his serves. Whooosh! The second of which Murray barely saw. Quick.

Change of ends...normal service resumed by Murray. Another hefty delivery is slapped into the tape by Isner.

Image source, Getty Images

Mini-break intact. A big serve to the Isner backhand comes back, but it lacks juice as Murray bounds on to the ball to smack down a forehand winner.