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Novak Djokovic plays in open training session in Serbia

Serbia's tennis player Novak Djokovic warms up before an open training session in Belgrade, Serbia on May 2, 2018. (Xinhua/Predrag Milosavljevic)

Serbia's tennis player Novak Djokovic signs after an open training session in Belgrade, Serbia on May 2, 2018. (Xinhua/Predrag Milosavljevic)