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(200621) -- ZADAR, June 21, 2020 (Xinhua) -- Novak Djokovic of Serbia returns the ball during a match of Adria Tour tennis tournament against Borna Coric of Croatia in Zadar, Croatia on June 20, 2020. Adria Tour is organized by Serbia's 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 Stanin/Pixsell via Xinhua) - Marko Dimic - 20.06.2020 Zagrzeb Tenis Adria Tour 2020 Xinhua / Sipa / PressFocus POLAND ONLY!!