Roger Federer of Switzerland leaves the court after he retired due to injury before his semifinal match against Jo-Wilfried Tsonga of France at the ATP Qatar Open tennis tournament in Doha Friday Jan 6, 2012. Federer pulled out of the Qatar Open due to back pain only 10 days before the start of the Australian Open. However the Swiss, who would be chasing a record 17th grand slam title in Australia, was confident he would be fit for the tournament in Melbourne, which starts on January 16 (AP Photo/Osama Faisal)

Associated Press
Roger Federer of Switzerland leaves the court after he retired due to injury before his semifinal match against Jo-Wilfried Tsonga of France at the ATP Qatar Open tennis tournament in Doha Friday Jan 6, 2012. Federer pulled out of the Qatar Open due to back pain only 10 days before the start of the Australian Open. However the Swiss, who would be chasing a record 17th grand slam title in Australia, was confident he would be fit for the tournament in Melbourne, which starts on January 16 (AP Photo/Osama Faisal)
Roger Federer of Switzerland leaves the court after he retired due to injury before his semifinal match against Jo-Wilfried Tsonga of France at the ATP Qatar Open tennis tournament in Doha Friday Jan 6, 2012. Federer pulled out of the Qatar Open due to back pain only 10 days before the start of the Australian Open. However the Swiss, who would be chasing a record 17th grand slam title in Australia, was confident he would be fit for the tournament in Melbourne, which starts on January 16 (AP Photo/Osama Faisal)
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