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Novak Djokovic, a fan favorite at the U.S. Open, blew kisses to an unusually hostile crowd at Arthur Ashe Stadium late Tuesday night after he defeated Taylor Fritz in four sets to advance to the semifinals.

Fritz, the final American man left in the tournament, had home-court advantage and by the halfway point of the match, it appeared that the fans had successfully gotten under Djokovic's skin.

Fritz supporters continued to cheer for faults by Djokovic, and in the third set, when the match had surpassed 10:30 p.m., the Serbian tennis star had had enough.

"What are you going to do?" he repeated as he approached chair umpire Damion Dumusois.

The crowd booed as Djokovic mocked Dumusois’ attempts to silence the crowd

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