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MALAKOFF, FRANCE - MAY 23: Maria Sharapova, Rafael Nadal, Serena Williams and Roger Federer attend the Nike Night Tennis mixed doubles presentation on May 23, 2013 in Malakoff, France. (Photo by Antonio de Moraes Barros Filho/Getty Images)

MALAKOFF, FRANCE - MAY 23: Maria Sharapova, Rafael Nadal, Serena Williams and Roger Federer attend the Nike Night Tennis mixed doubles presentation on May 23, 2013 in Malakoff, France. (Photo by Antonio de Moraes Barros Filho/Getty Images)