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Stefanos Tsitsipas has scored wins over Roger Federer and Rafael Nadal this season.
Yet, the sixth-ranked Greek names nemesis Felix Auger-Aliassime as the toughest opponent he's faced and asserts the 18-year-old Canadian will beat both Grand Slam champions and crack the Top 5.
More: Auger-Aliassime Tops Tsitsipas at Queen's Club
Auger-Aliassime denied all seven break points he faced maintaining his mastery of Tsitsipas, 7-5, 6-2, to roar into his fifth semifinal of the season at Queen's Club.
It was Auger-Aliassime's second straight-sets win over Tsitsipas this season prompting the world No. 6 to tout the Canadian teenager as his toughest opponent and a better player.
"He's the most difficult opponent I've ever faced," Tsitsipas said afterward. "He has one of the best returns on the tour. He has a really powerful, accurate serve, which is tough to read. He's really quick and fast, which is rare to find all of that combinations together, combined. Big forehand, big backhand. He can create a lot of opportunities from his backhand, but also, at the same time, he can be very aggressive from the forehand side.
"There's not much to come up with when you play against him. He's pretty much solid from everywhere."
Tsitsipas stunned 20-time Grand Slam king Federer at the Australian Open in January, topped 12-time Roland Garros champion Nadal in Madrid last month and asserts Auger-Aliassime will beat both legendary champions.
"He has the whole package to play big," Tsitsipas said of Auger-Aliassime. "I'm sure if he ever gets the chance to play Nadal, Djokovic or Federer, he's going to beat them for sure.
"I will not be surprised if he gets wins over those guys. We will definitely see him in the Top 5. Maybe not this year but next year or the year after."
Regardless of ranking, Tsitsipas regards Auger-Aliassime a better player though the Canadian says the rankings don't lie.
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"It's upsetting obviously that he's better than me," Tsitsipas told the media at Queen's Club. "I have to accept that he's better than me. I might never beat him, but if I think that way, just need to wait, years maybe, for that chance to come.
"If not, then not. If yes, then fantastic. I'll donate £10,000 for that win to a charity."
Photo credit: Lindsey Godwin/Miami Open