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Roger Federer of Switzerland returns the ball during the men's singles semi-final match against Rafael Nadal of Spain at the 2019 Wimbledon Tennis Championships in London, Britain, on July 12, 2019. (Xinhua/Han Yan)
Roger Federer of Switzerland returns the ball during the men's singles semi-final match against Rafael Nadal of Spain at the 2019 Wimbledon Tennis Championships in London, Britain, on July 12, 2019. (Xinhua/Han Yan)