ABC News’ Morgan Norwood is at the Billie Jean King National Tennis Center, where the U.S. Open is set to begin, breaking down the biggest tennis stars to watch.

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Daniil Medvedev’s match was delayed more than six minutes between points Sunday night, after a photographer entered the court on match point and the 2021 U.S. Open champion became enraged by the chair umpire’s decision to award his opponent a first serve.