Djokovic ready to defend Wimbledon trophy
Xinhua
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Novak Djokovic of Serbia returns the ball during an open training session in Belgrade, Serbia, June 19, 2019. (Xinhua/Predrag Milosavljevic)

Novak Djokovic of Serbia speaks to the media during an open training session in Belgrade, Serbia, June 19, 2019. (Xinhua/Predrag Milosavljevic)