Stefanos Tsitsipas’s US Open run ended in a tense five-set battle, but what really has people talking is the underarm serve tactic used by Daniel Altmaier. Tsitsipas, clearly frustrated, confronted Altmaier after the match, hinting he might retaliate if it happens again. The crowd was divided, with some booing and others intrigued by the rare move. With Tsitsipas’s recent coaching changes and ranking drop, is this just a rough patch or a sign of bigger struggles? What do you think about underarm serves—clever strategy or unsportsmanlike? #Sports #Tennis #USOpen