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Lukas Lacko of Slovakia reacts 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 reacts 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)