
Kei Nishikori of Japan returns the ball during the men's semifinal against Mischa Zverev of Germany at the Geneva Open ATP 250 Tennis tournament, in Geneva, Switzerland, May 26, 2017. Mischa Zverev won 2-1. (Xinhua/Alain Grosclaude)

Kei Nishikori of Japan returns the ball during the men's semifinal against Mischa Zverev of Germany at the Geneva Open ATP 250 Tennis tournament, in Geneva, Switzerland, May 26, 2017. Mischa Zverev won 2-1. (Xinhua/Alain Grosclaude)