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Joao Sousa of Portugal serves during the men's singles fourth round match between Rafael Nadal of Spain and Joao Sousa of Portugal at the 2019 Wimbledon Tennis Championships in London, Britain, on July 8, 2019. (Xinhua/Lu Yang)

Joao Sousa of Portugal serves during the men's singles fourth round match between Rafael Nadal of Spain and Joao Sousa of Portugal at the 2019 Wimbledon Tennis Championships in London, Britain, on July 8, 2019. (Xinhua/Lu Yang)