
Japan's Kei Nishikori hits a return to Spain's Rafael Nadal during the men's singles quarterfinal match at the 2015 Rogers Cup in Montreal, Canada, on Aug. 14, 2015. Kei Nishikori won 2-0. (Xinhua/Andrew Soong)

Japan's Kei Nishikori hits a return to Spain's Rafael Nadal during the men's singles quarterfinal match at the 2015 Rogers Cup in Montreal, Canada, on Aug. 14, 2015. Kei Nishikori won 2-0. (Xinhua/Andrew Soong)