All that hard work is in danger of being undone as Murray finds himself three break points down in his first service game of the second set. He saves the first, and the second, and the third, courtesy of a bold and brave backhand down the line from Murray. Deuce. And deuce again.

Murray slips as he hits a forehand error and it's a fourth break point of the game for Federer. The Swiss dumps a backhand into the net and lets out a sigh. Eight more deuces - which include one breathtaking rally of 22 shots and a further two break points for Federer - follow in this marathon game, which lasts 19 minutes, before Murray converts game point, on the 11th deuce, to seal the hold.

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Jonni Ash: Murray's refusal to recognise a lost cause is heartwarming... It's also what has made him a champion in an era when there were already too many.

Murray has a big opportunity to rustle up two break points but he looks on in agony as he sees a passing shot drift wide of the tramlines. Federer regroups and secures a hold courtesy of a delicate drop volley.

David Law
BBC Radio 5 live sports extra commentator

"Murray found it, but perhaps more significantly Federer lost it. There was just a reminder there of the Federer we saw last year that can buckle, the Federer we never saw in 2006. Roger Federer should have won that in straight sets."

Listen to live commentary on BBC Radio 5 live sports extra

Goran Ivanisevic
Former Wimbledon champion on BBC Radio 5 sports extra

"It's amazing but that's tennis. That's Andy Murray who never gives up, but I was surprised by Roger. When he served for the match, he didn't do anything and all credit to Andy, he stepped up."

Image source, Getty Images

Murray holds his serve to move 7-6 ahead and then looks on as Federer shanks a forehand out of court. Murray wins the tie-break 8-6! The Scot lets out a shout of encouragement, his team box explodes with excitement. We're into a fourth set. Now be honest, who saw that coming?

Murray does what he needs to do, holding both his serves to reduce the deficit to 5-4 but Federer brings up two match points as a Murray return goes long. Gutsy play from Murray, holding in there with some heavy hitting and forcing the Federer mistake, and then remarkably, he forces another error from the Swiss' racquet and we're back level at 6-6 at the second change of ends.

Excellent stuff from both Murray and Federer early in this tie-break to bring up 2-2, but it's the Briton who breaks down first. Federer secures the first mini-break and Murray smashes his hand against his racquet strings in frustration. Federer, who is becoming more defensive as the finish line approaches, consolidates the mini-break. Federer leads 4-2 at the change of ends after Murray goes long again.

Murray has a real chance to keep the pressure on Federer, but he doesn't take it. The Swiss instead races through the game to love to force the tie-break.

Goran Ivanisevic
Former Wimbledon champion on BBC Radio 5 sports extra

"This is much better from Andy, much more aggressive."

I'm not sure you can call it a momentum change, but Murray has certainly upped his intensity. The Scot clenches his fist every time he wins a point on his serve, and he's winning a fair few of them now. His girlfriend Kim Sears is on her feet in the stands and there's clapping all round as Murray seals his hold to 15.

Image source, AFP

Two uncharacteristic errors from Federer give Murray 0-30 for the first time in the match. The Scot clenches his fist. He can sense a chance. Federer reduces the deficit, but another error gives Murray his first break points of the match. A Federer smash saves the first one but the Swiss goes long! Murray breaks. "Come on," shouts Murray, to the delight of the crowd.

Andrew Scammell:, external So Federer beating Murray who has been out injured means he's back to his greatest form? Let's see how he does against Rafa.

Robbie Waddup:, external Murray playing well, not much more he can do, should never be a quarter-final match.

Siddharth Vinay:, external This has to be Federer's Australian Open with Djoko out and Murray thrashed by the legend himself.. The fifth one is one its way.

Goran Ivanisevic
Former Wimbledon champion on BBC Radio 5 sports extra

"We said from the beginning it doesn't look good. Roger has constantly been putting the pressure on, it had to happen."

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It's magnificent from Federer, the Swiss scooping up a ball which looks millimetres from the ground on the second bounce to bring up 15-30. Another error from Murray gives Federer two break points, but he only needs one as Murray's forehand breaks down. Federer to serve for the match.

Federer is in his element, hitting three successive clean winners to race to 40-0 up. With nothing to lose, Murray swings out at a return, and it lands in for a winner. The Scot wins the next point, too, rushing to the net and putting away a smash, but Federer stops the rot with another scintillating forehand which Murray can do nothing about.

Goran Ivanisevic
Former Wimbledon champion on BBC Radio 5 sports extra

"Andy has to do something but it's not easy. Roger is serving well, placing the ball great and then just attacking. This is not the same Roger Federer as last year and the year before."

Murray throws in a comfortable hold of his own, at some points showing signs that he's capable of dictating and getting Federer on the run. Is it too little, too late, though?

Goran Ivanisevic
Former Wimbledon champion on BBC Radio 5 sports extra

"Roger is winning his serves so easily, it's not an even contest and it has been like that from the start."

Listen to live commentary on BBC Radio 5 live sports extra

Image source, Getty Images

Federer coasts through another service game to pile the pressure back on Murray.