Young Greek tennis star Stefanos Tsitsipas secured the biggest win of his career so far when he beat Wimbledon champion Novak Djokovic in the third round of the Rogers Cup in Toronto with a stunning 6-3 6-7(5) 6-3.

After putting out Austrian Dominic Thiem in the second round, the Greek teenager — he turns 20 on Sunday — was all confidence against the Serbian star.

According to Reuters, Tsitsipas relied on his serve and forehand combination to get by Djokovic, who was competing in his first tournament since collecting his 13th grand slam title at the All England Club last month.

The Greek tennis player won the first set, but some mistakes in the second allowed his experienced opponent to tie. However, Tsitsipas did well to break Djokovic for a 2-0 lead in the third set and never looked back.

“It’s a dream of any kid out there in this world, any kid playing tennis, to beat these kinds of players, so I can call it the best moment of my life,” Tsistsipas said