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(170531) -- PARIS, May 31, 2017 (Xinhua) -- Jozef Kovalik of Slovakia returns the ball to Stan Wawrinka of Switzerland during the men's singles 1st round match at French Open Tennis Tournament 2017 in Paris, France on May 30, 2017. Jozef Kovalik lost 0-3. (Xinhua/Chen Yichen) 30.05.2017 Paryz Tenis ziemny Roland Garros 2017 FOTO Xinhua / SIPA / PressFocus POLAND ONLY!!