Stefanos Tsitsipas is amazed, but not surprised by his record run in Toronto.

The 19-year-old Greek teen denied two match points in the tie break dethroning defending Rogers Cup champion Alexander Zverev, 3-6, 7-6 (11), 6-4.

Watch: Tsitsipas Stuns Zverev

It was Tsitsipas first career Top 5 victory sending him into his first Masters 1000 semifinal against Wimbledon finalist Kevin Anderson.

If Tsitsipas beats Anderson, he will become the first man to knock off four Top 10 opponents at the same tournament since the inception of the ATP World Tour.

"Amazing. Achieving such things makes me feel nice," Tsitsipas told the media in Toronto. "I'm very proud of who I am and at such age to do this kind of results, which I never expected. I always thought it's going to be take more years for this to happen. But with the hard work that I've been doing, it's no surprise to me."

Tsitsipas has defeated Dominic Thiem, Wimbledon champion Novak Djokovic and the third-ranked Zverev in succession and believes he belongs with the best.

"I believe I have the game to compete against these players," Tsitsipas said. "I'm feeling very confident. And in terms of, as I said, of my game, I feel like I belong in this level. I feel like I have it and that I can compete against these players and play lots of matches against them and have a positive head-tohead against them.

"And I feel proud of myself. I feel proud of my country. And I feel proud that I'm showing my best out on the court on such big stages, and that I can make tennis in Greece the thing."

Rallying from a one-set, 2-5 deficit, Tsitsipas stunned Zverev a week after falling in straight sets to the 21-year-old German in Washington, DC. Asked his relationship with Zverev, Tsitsipas replied "the relationship is okay."

"I mean, it's all right," Tsitsipas said. "It's not too bad. It's not too good. It's balanced."

Photo credit: Christopher Levy