NEW YORK :A frustrated Stefanos Tsitsipas took exception to his opponent's tactics after blowing a match point and exiting the U.S. Open in the second round courtesy of a five-set loss to Daniel Altmaier on Thursday.

The 7-6(5) 1-6 4-6 6-3 7-5 defeat means former world number three Tsitsipas will end the season without playing in the third round of a Grand Slam for the first time since 2017.

Altmaier deployed the legal but rarely used underarm serve a few times as he rallied in the fourth set and Tsitsipas let the German know he did not approve as the pair shook hands at the end of a contest that lasted four hours and 26 minutes.

"Next time, don't wonder why I hit you, okay? No, I'm just saying if you serve underarm ... if you serve underarm," Tsitsipas told Altmaier, implying he had ta

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