Stan Wawrinka of Switzerland reacts after winning the fourth set against Kei Nishikori of Japan
Stan Wawrinka of Switzerland reacts after winning the fourth set against Kei Nishikori of Japan during their quarter-final match at the 2014 U.S. Open tennis tournament in New York, September 3, 2014. Reuters

Swiss no. 2 Stan Wawrinka spends time to mentally and physically recover from a heartbreaking loss to fellow Swiss Roger Federer, 4-6, 7-5, 7-6 (8-6) at the semi-final of the ATP World Tour Finals. The 29-year-old winner of the Australian Open champion missed four match points, while Federer earned the chance to face the world no. 1 Novak Djokovic.

According to Wawrinka via supersport.com, although the match was not really physical, it was a tough game. He said that he needs to take one day off, to do some treatment and rest. He further claimed that it was difficult for him to play against Federer not only because he is the best player ever, but he also knows how to play.

Meanwhile, just recently, Federer revealed his withdrawal from his match against Novak Djokovic at the ATP World Tour Finals because of a back injury. Federer, who has won the tournament six times, confirmed his withdrawal following the doubles finals on Sunday. He was apologetic to the crowd at the O2 Arena when he announced that he was "not match-fit" for the game.

"I hope you understand, I wanted to come out personally and explain," Federer said according to BBC. "I did everything I could. I took pain-killers, had rest until the very end, but I just cannot compete at this level with Novak. Federer revealed that at his age, playing against Federer in his current condition would've been risky. But then again, the world no. 2 is hopeful that his back problems will be resolved soon.

Federer is set to join his fellow Swiss, Wawrinka for the Davis Cup finals against France next week. He revealed that after his plans for recovery he will travel to France to prepare and train for the clay.

With Federer's withdrawal, Djokovic secured his fourth victory at the season-finale event and he also became the first man to win three titles successively since Ivan Lendl in the 1980s. In lieu of the final match, the organisers of the ATP World Tour Finals arranged two exhibition matches.

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