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(180105) -- PERTH, Jan. 5, 2018 (Xinhua) -- Roger Federer of Switzerland serves during the men's singles match against Jack Sock of the United States on day 6 of the Hopman Cup tennis tournament in Perth, Australia, Jan. 4, 2018. (Xinhua/Zhou Dan) - Zhou Dan - 04.01.2018 Perth Australia Tenis ziemny Puchar Hopmana 2018 FOTO Xinhua / SIPA / PressFocus POLAND ONLY!!