Holger Rune has been a heavy talking point in the past week after his incident with Alejandro Davidovich Fokina at the Madrid Open and has raised debates about his antics.
Including a player who in his career was not shy about his on-court persona in John McEnroe.
"I've said this before, I'll say it again, it's hard to be a total asshole and be on the tennis tour, okay? It's possible to do it but you end up living a very lonely existence," he said on his brother Patrick McEnroe's Holding Court podcast.
"He likes to ham it up, he likes to engage the crowd, but he does it in a way that kind of irritates his opponents at times. Certainly irritates the crowd. So what's happening is, he's developing a reputation," he added.
But by the same token, he sees a player who can get to the very top.
"I think Rune will come around. I do think he's a threat to do some serious damage at the French [Open this year]. The guy is a tremendous talent, brings a ton of energy to the court. I think he's capable of winning Majors. This year, probably not. He still to me is a little bit up and down in the course of matches, but we've seen him play great and big matches," he opined.