Stefanos Tsitsipas was eliminated from the U.S. Open on Thursday in a major upset, and he was openly unhappy with his opponent after the match. Tsitsipas ...

Stefanos Tsitsipas angrily hit out at his opponent’s use of the underarm serve after he blew a match point during a humbling US Open exit.

Altmaier used the controversial underhand tactic as part of a rally to win in five sets, 7-6 (5), 1-6, 4-6, 6-3, 7-5, in a ...

Stefanos Tsitsipas confronted Daniel Altmaier and expressed his disapproval at his opponent’s underarm serving after a five-set defeat to the German in the US Open second round.

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 ...

The No. 26 seed had some choice words for opponent Daniel Altmaier after the German, ranked No. 56, used an underarm serve during their dramatic second-round battle. Altmaier went on to complete a 7-6 ...

Footage from the stands showed Daria Medvedeva, who has two children with the tennis star, with her head in her hands as she ...