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