A Wawrinka return sails long and Djokovic looks skywards, the sight of a relieved man who knows, at 40-15, he is just within one point of tapping a nail into Wawrinka's coffin. Boris Becker seems to have ants in his pants, he's scuffling uneasily in his seat and nervously jumps out of his chair once Djokovic has made sure of the game.

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A double fault from Wawrinka - his fourth of the match - is the cherry on top of the parfait for Djokovic because he now has two break points. Wawrinka saves one... but what about the next point? Djokovic passive, content to retrieve all day long, while Wawrinka is prepared to gamble, though this time he loses his chips, a dodgy backhand and Djokovic is back in control.

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Leon Smith
GB Davis Cup captain

"This match was written to become a five-set match with all the history and the flow of the match. It has been up and down and one player has gone ahead then given the lead back on a plate.

"You get the feeling Stan Wawrinka is maybe in a slightly better place in his game. He looks a bit more secure. You know what to expect with Wawrinka. He is a shot-maker, a powerful player and he will hit winners. But so much of Novak Djokovic's game is about his resilience, but you don't feel he is coping with Wawrinka's power at the moment."

Oh boy, it's going to take some stamina and nerve to get through this set. Neither player has had the upper had for too long in this match, but Wawrinka has dazzled on occasions with his shot-making so, perhaps, he is the slight favourite. When the Serb attempts to unleash some venom he usually overcooks it, which is what he does with a forehand which causes a sprinkle of nervous energy to ripple through the stadium at 15-30.

Djokovic fights back - but a well-timed Wawrinka backhand into the corner takes us to deuce. Another delicious backhand from Wawrinka. In or out? Out or in? It's called out, Wawrinka didn't hear the call... there's a debate between the players and the judge. Wawrinka says: "I thought you were challenging." Djokovic accepts the explanation and returns to defend a break point. Another backhand into the same corner from Wawrinka, but this time it bounces long. Djokovic with a rare foray into the tape... Wawrinka racing along the baseline and is a fraction wide with the forehand. Wawrinka a fraction wide with a forehand into the other corner and Djokovic escapes.

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Wawrinka with a serve towards the Djokovic ribcage and the Serb can't get his feet out of the way. But on the next point Djokovic plays with the freedom of a man with nothing to lose and that unnerves Wawrinka, who crashes a backhand into the tramlines. But a thunderclap of a serve from Wawrinka brings up two set points and a phenomenal forehand from Wawrinka ends the set. The spectators are yee-hawingly vocal. Anyone for a fifth set?

Ed Allchorne:, external The quality of tennis in this match is just outrageously high at the moment.

James Alex:, external Considering their fantastic battles why isn't Wawrinka v Djokovic ever the Grand Slam Final itself. That's what fans love.

Charles Nurick:, external I'm meant to be doing work but this match won't let me! Bye bye education.

Earlier today we asked who you want to face Andy Murray in the final.

Well, the results are in and 65.5% want Stan Wawrinka to fight back and move into Sunday's final, with 34.5% voting for Novak Djokovic.

You might just get your wish on this form...

At 30-15 Wawrinka has a chance on the Djokovic serve but he swishes too early on the backhand return and nets. Perhaps the Swiss is saving himself for tougher contests. Djokovic with a pretty straightforward hold.

Tom Holmes:, external Djoko v Stan looks to be an absolute thriller and I'm stuck in a lecture following it on BBC Sport.

Wawrinka's power from the baseline is unsettling Djokovic and the usually relentless Serb is unable to grapple any sort of momentum from the back of the court. The finest returner in the game goes long, allowing Wawrinka to assert his dominance with a hold to love.

Leon Smith
GB Davis Cup captain

"The match has come to life and this is what we have waited for. The crowd are getting excited. The story of the match continues. Who really wants this?

"I'm sure they both do, but it's bizarre seeing the number of unforced errors. Andy Murray must be rubbing his hands with delight that this match may be going to five sets."

Wawrinka looks towards the other side of the net, it's almost as if he's doing a double-take to make sure the man in blue is Novak Djokovic because the top seed's serves are strangely below par. The Swiss with three break points and, much to the delight of the crowd, he breaks.

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The rallies are becoming longer, both players peppering the court with crafty shots at zany angles as they attempt to outwit the other. Wawrinka with a stunning backhand winner down the line for 30-0. Circus shots from the Swiss as he retrieves a Djokovic lob - he then sprints towards the darkest corner of the baseline to fetch a Djokovic overhead... the crowd scream as if they're on a rollercoaster... Wawrinka still going, attempting to catch another overhead but this time he fails. The world number four has found his groove and holds to 30.

Djokovic keeping the points short so I'll keep the sentences just as short. By the time I put a full stop at the end of this sentence the Serb has held to 15 and is in front again.

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Leon Smith
GB Davis Cup captain

"Somebody has to get some sustained period of quality and whoever does that will go on to win this set. There is something written in the stars that says this will go the distance into five sets. "

Wawrinka lifts his racquet towards the pavilion and kisses his cap as he hits the half-century, rattling off 51 unforced errors so far in this match, no 52, no 53. Djokovic just a bystander in this game, watching Wawrinka teetering. Three break points. Wow! One saved a stonking forehand winner into the corner from the Swiss. Wow! Wow! Wow! Two saved as the defending champion's drop shot kisses the tramline. Wawrinka raises his index finger. Djokovic puffs his cheeks. A mammoth rally ensues... Djokovic folding like a deckhair in the wind and we're back to deuce! Marvellous.

The pair now working the crowd like two old music hall queens. Super from Wawrinka - clobbering an overhead beyond Djokovic. The Serb's forehand drifts long on the next point and Wawrinka is back and firing.

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At 15-30 Wawrinka has a sniff... and there's a strong stench of an upset as a lineswoman screams "out" only for HawkEye to show that Djokovic's forehand was in by 0.000001mm. We play the point again, but Djokovic is still off-par, gifting Wawrinka two break points and my oh my, that's ugly from a flat-footed Djokovic, dragging a backhand wide to surrender the initiative.

Martin:, external The more you see of this match, the more you fancy Andy Murray to lift the title.

Aveed Wocha:, external Andy on present form could and probably should win the final in straight sets.

Andrew Neill:, external Neither looking like their best. This will come down to belief and which way the pendulum has swung in the latter stages.

Wawrinka wrong foots Djokovic with a thunderclap of a forehand, but still finds himself having to defend a break point. A big serve comes to the Swiss' rescue, to deuce we go, and an ill-judged forehand from Djokovic allows the defending champion to nudge ahead to advantage. Djokovic pulls Wawrinka back to deuce, but the Swiss wrestles himself free with a 120mph boomer of an ace. They wouldn't employ Wawrinka on Wall Street, however, because the the 29-year-old can't close out the deal. Djokovic with break point... Wawrinka attacks; races to the net but slaps the volley into the tape.