PARIS, FRANCE - MAY 24: Kei Nishikori of Japan plays a forehand in his Men's Singles match against Paul-Henri Mathieu of France on day one of the 2015 French Open at Roland Garros on May 24, 2015 in Paris, France. (Photo by Clive Mason/Getty Images)
PARIS, FRANCE - MAY 24: Kei Nishikori of Japan plays a forehand in his Men's Singles match against Paul-Henri Mathieu of France on day one of the 2015 French Open at Roland Garros on May 24, 2015 in Paris, France. (Photo by Clive Mason/Getty Images)