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Lukas Lacko of Slovakia hits a return during the men's singles second round match against Roger Federer of Switzerland at the Wimbledon Tennis Championships in London, Britain on July 4, 2018. Federer won 3-0. (Xinhua/Guo Qiuda)
Lukas Lacko of Slovakia hits a return during the men's singles second round match against Roger Federer of Switzerland at the Wimbledon Tennis Championships in London, Britain on July 4, 2018. Federer won 3-0. (Xinhua/Guo Qiuda)