Juan Martin del Potro of Argentina returns in his quarter final match against Roger Federer of Switzerland at the French Open tennis tournament in Roland Garros stadium in Paris, Tuesday June 5, 2012. (AP Photo/Christophe Ena)

Associated Press
Juan Martin del Potro of Argentina returns in his quarter final match against Roger Federer of Switzerland at the French Open tennis tournament in Roland Garros stadium in Paris, Tuesday June 5, 2012. (AP Photo/Christophe Ena)
Juan Martin del Potro of Argentina returns in his quarter final match against Roger Federer of Switzerland at the French Open tennis tournament in Roland Garros stadium in Paris, Tuesday June 5, 2012. (AP Photo/Christophe Ena)
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