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(210911) -- NEW YORK, Sept. 11, 2021 (Xinhua) -- Alexander Zverev of Germany serves during the men's singles semifinals of the 2021 US Open between Novak Djokovic of Serbia and Alexander Zverev of Germany in New York, the United States, Sept. 10, 2021. (Photo by Michael Nagle/Xinhua) 10.09.2021 Nowy York Tenis US Open FOTO Michael Nagle / Xinhua / PressFocus POLAND ONLY!!