MELBOURNE, AUSTRALIA - JANUARY 23: Roger Federer of Switzerland celebrates winning a break point in his Quarterfinal match against Jo-Wilfred Tsonga of France during day ten of the 2013 Australian ... more 

MELBOURNE, AUSTRALIA - JANUARY 23: Roger Federer of Switzerland celebrates winning a break point in his Quarterfinal match against Jo-Wilfred Tsonga of France during day ten of the 2013 Australian Open at Melbourne Park on January 23, 2013 in Melbourne, Australia. (Photo by Mark Kolbe/Getty Images) less