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Tennis player Juan Martin del Potro competes in the 4th round at the 2018 U.S. Open in Flushing NY on September 3, 2018. Juan Martin del Potro defeated John Isner. (Photo by Andrew Schwartz) 04.09.2018 Nowy Jork Tenis US Open 2018 Andrew Schwartz / Sipa / PressFocus POLAND ONLY!!