Well... He isn't. Like, certainly not compared to Tsitsipas. He may have his share of catastrophe's in his career (literally every player does), but one thing he has never appeared to be is afraid of the big stage, or the big match, or the big opponent. He has a joke of a second serve, but it's bad all the time, it doesn't just break down under pressure. That isn't the same thing.Thank God Zverev is not a choker then.