France's Gael Monfils returns the ball to Switzerland's Roger Federer during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, Sunday, May 31, 2015 in Paris. (AP Photo/Francois Mori)
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France's Gael Monfils returns the ball to Switzerland's Roger Federer during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, Sunday, May 31, 2015 in Paris. (AP Photo/Francois Mori)
