Switzerland's Roger Federer looks down during a break as he plays France's Jo-Wilfried Tsong74during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Tuesday, June 4, 2013 in Paris. Tsonga won 7-5, 6-3, 6-3. (AP Photo/Michel Spingler)

Associated Press
Switzerland's Roger Federer looks down during a break as he plays France's Jo-Wilfried Tsong74during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Tuesday, June 4, 2013 in Paris. Tsonga won 7-5, 6-3, 6-3. (AP Photo/Michel Spingler)
Switzerland's Roger Federer looks down during a break as he plays France's Jo-Wilfried Tsong74during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Tuesday, June 4, 2013 in Paris. Tsonga won 7-5, 6-3, 6-3. (AP Photo/Michel Spingler)
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