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LONDON, July 7, 2017 Juan Martin Del Potro of Argentina hits a return during the men's singles second round match against Ernests Gulbis of Latvia at the Championship Wimbledon 2017 in London, Britain, on July 6, 2017. Ernests Gulbis won 3-0. 06.07.2017 Londyn Tenis Wimbledon 2017 Jin Yu / Xinhua / Sipa / PressFocus POLAND ONLY!!