![200621) -- ZADAR, June 21, 2020 (Xinhua) -- Alexander Zverev of Germany returns the ball during a match of Adria Tour tennis tournament against Danilo Petrovic of Serbia in Zadar, Croatia on 200621) -- ZADAR, June 21, 2020 (Xinhua) -- Alexander Zverev of Germany returns the ball during a match of Adria Tour tennis tournament against Danilo Petrovic of Serbia in Zadar, Croatia on](https://c8.alamy.com/comp/2C3KCYY/200621-zadar-june-21-2020-xinhua-alexander-zverev-of-germany-returns-the-ball-during-a-match-of-adria-tour-tennis-tournament-against-danilo-petrovic-of-serbia-in-zadar-croatia-on-june-20-2020-adria-tour-is-organized-by-serbias-tennis-player-novak-djokovic-in-order-to-promote-sports-positive-values-and-fair-play-and-also-to-raise-funds-for-those-who-need-help-dino-staninpixsell-via-xinhua-2C3KCYY.jpg)
200621) -- ZADAR, June 21, 2020 (Xinhua) -- Alexander Zverev of Germany returns the ball during a match of Adria Tour tennis tournament against Danilo Petrovic of Serbia in Zadar, Croatia on
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200621) -- ZADAR, June 21, 2020 (Xinhua) -- Grigor Dimitrov of Bulgaria returns the ball during a match of Adria Tour tennis tournament against Borna Coric of Croatia in Zadar, Croatia on
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