Greek tennis star Stefanos Tsitsipas’ choice words for German opponent Daniel Altmaier were caught on a hot mic after he beat him at the U.S. Open.

After Altmaier defeated the Greek star in five sets in the second round of the games, Tsitsipas threw shade at him for using the rare underhand serve and indicated he tried to strike him with a ball, according to The Guardian.

“Next time, don’t wonder why I hit you, OK? No, I’m just saying if you serve underarm,” Tsitsipas said as the pair shook hands following the match.

Altmaier responded by patting him on the shoulder.

As the German star started to move away from him, Tsitsipas walked closer, repeating, “If you serve underarm.”

An underhand serve is legal in tennis, but is considered a controversial tactic since it can catch an opponen

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