Tsitsipas shows win over Federer no fluke

He's also a millennial, through and through, even promoting his 27,000-follower YouTube channel during his on-court interview.

"Guys, if you haven't subscribed, please do so," he told the crowd.

No man as young as Tsitsipas had been this far at any Grand Slam tournament since Novak Djokovic at the 2007 US Open or at the Australian Open since Andy Roddick in 2003.

"It all feels like a fairytale, almost; I'm just living the dream, living what I've been working hard for," said Tsitsipas, who dropped his racket, fell on his back and covered his face with his hands when the match ended.