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Frances Tiafoe of the United States serves during the men's singles final match against Portugal's Joao Sousa at the Estoril Tennis Open in Cascais, Portugal, May 6, 2018. Sousa won 2-0 to claim the title. (Xinhua/Zhang Liyun)
Frances Tiafoe of the United States serves during the men's singles final match against Portugal's Joao Sousa at the Estoril Tennis Open in Cascais, Portugal, May 6, 2018. Sousa won 2-0 to claim the title. (Xinhua/Zhang Liyun)