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(181001) -- BELGRADE, Oct. 1, 2018 (Xinhua) -- Serbia's tennis player Novak Djokovic (R) returns the ball, while his coach Marian Vajda looks on during an open training session in Belgrade, Serbia on Oct. 1, 2018. (Xinhua/Predrag Milosavljevic) - Predrag Milosavljevic - 01.10.2018 Belgrad Tenis Trening Novaka Djokovica Xinhua / Sipa / PressFocus POLAND ONLY!!