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Roger Federer celebrates his semi-final win against Stanislas Wawrinka at the ATP World Tour Finals. The two players slugged it out for nearly three hours. Image Credit: AFP

London: Days before Roger Federer and Stanislas Wawrinka team up for a shot at Switzerland’s first Davis Cup title, they were tearing lumps out of each other at the ATP World Tour Finals in London on Saturday.

Federer spent nearly three hours fighting off Wawrinka in an intense semi-final, admitting he was fortunate to save four match points before scraping through 4-6 7-5 7-6(6) and setting up a blockbuster season finale against Novak Djokovic.

Wawrinka’s nerve failed him when serving for the match at 5-4 in the third set and Federer conceded he could easily have been the one left to contemplate a semi-final exit.

“I clearly got lucky tonight. There’s no doubt about that,” Federer said. “But you’ve got to keep believing that maybe there is a slight chance that you are going to be able to turn it around somehow.

“It’s hard on Stan,” the six-times Tour Finals champion added. “I think if he would have served a little bit better today he would have won.”

Wawrinka was cramping up in the deciding tiebreak and both players looked out on their feet after a thrilling toe-to-toe battle.

“Hopefully he will recover from this fast enough, that would be good for both of us,” Federer told reporters at almost 1 am local time. “I checked on him immediately after the match to see if he was okay.”

Quite what Swiss Davis Cup coach Severin Luthi would have made of it is anyone’s guess and he will hope Federer does not get too bashed up by Djokovic in their 37th meeting on Sunday.

France, their opponents in the Davis Cup final, would have enjoyed the sight of Switzerland’s two heavyweights digging deep into their energy reserves on Saturday night.

Wawrinka, who had won only two of 16 meetings with his close friend, was the better player for most of the evening, yet when his chance came he found the last point impossible to win.

Gambling on serving and volleying on his three match points at 5-4, he first saw Federer rifle a winning forehand past him, the second match point he dumped a feeble volley into the net.

On the third, a nervy volley sat up and allowed Federer an easy pass into an open court.

Another opportunity came and went in the tiebreak before Federer coolly ended the contest.

“Stan looked very good for a long time, I was able to win the second set somehow by hanging around,” Federer said.

Wawrinka said Federer’s experience had been the difference in the end.

“I had some big opportunities in the third set,” the Australian Open champion said. “I should have taken them, especially serving for the match with three match points.

“But when you play Roger, it’s never easy for me, for anybody. He’s been in that situation so many times.” Federer said he would have to take his game to another level to end Djokovic’s 31-match indoor winning streak.

“I hope I can maybe play a little better than I played today because I did feel the heat from Stan,” he said.

“But I’m looking forward to the match. I hope it’s going to be a good one.”