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.

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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