Zverev, Thiem win men's singles 4th round at French Open

Kei Nishikori of Japan eyes on the ball during the men's singles fourth round match against Dominic Thiem of Austria at the French Open Tennis Tournament 2018 in Paris, France, on June 3, 2018. Kei Nishikori lost 1-3. (Xinhua/Chen Yichen)