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South Africa's Kevin Anderson serves the ball during second round match of Estoril Open Tennis tournament against Greece's Stefanos Tsitsipas in Cascais, near Lisbon, Portugal, May 3, 2018. (Xinhua/Zhang Liyun)
South Africa's Kevin Anderson serves the ball during second round match of Estoril Open Tennis tournament against Greece's Stefanos Tsitsipas in Cascais, near Lisbon, Portugal, May 3, 2018. (Xinhua/Zhang Liyun)