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(170705) -- LONDON, July 5, 2017 (Xinhua) -- Switzerland's Roger Federer hits a return during the men's singles first round match against Ukraine's Alexandr Dolgopolov at the Championship Wimbledon 2017 in London, Britain, on July 4, 2017. Federer advanced to the second round after Dolgopolov retired due to injury. (Xinhua/Tang Shi) 04.07.2017 Londyn Tenis ziemny Wimbledon 2017 FOTO Xinhua / SIPA / PressFocus POLAND ONLY!!