Alexander Zverev does not immediately realize he has won the US Open during an unusual moment after the final point. Reports say he loses track of the score while preparing to receive the next serve, rather than reacting to the outcome with an instant celebration.
Multiple outlets describe the same scenario: Zverev is focused on the mechanics of play—waiting for or expecting serve—when the match has already ended. The incident is presented as a brief, odd lapse in attention, with the context being that he is securing his second Grand Slam singles title.
While the coverage differs mainly in how it characterizes the “bizarre” nature of the moment, there is no contradiction about what happens. In each account, the key point is that Zverev appears unaware that he has completed a championship-winning victory and only later moves toward recognizing the result.