Roger Federer of Switzerland celebrates after defeating Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)
Roger Federer of Switzerland puts off the shirt during a break in his fourth round match against Jo-Wilfried Tsonga of France at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)
Roger Federer of Switzerland serves to Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aaron Favila)
Roger Federer of Switzerland serves to Jo-Wilfried Tsonga of France during their fourth round match at the Australian Open tennis championship in Melbourne, Australia, Monday, Jan. 20, 2014.(AP Photo/Aijaz Rahi)