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