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(190608) -- PARIS, June 8, 2019 (Xinhua) -- Ground staff clear the water on the rain cover over the clay court during the men's singles semifinal match between Dominic Thiem of Austria and Novak Djokovic of Serbia at French Open tennis tournament 2019 at Roland Garros, in Paris, France on June 8, 2019. (Xinhua/Han Yan)