TORONTO, August 10, 2018 (News Wires) - Stefanos Tsitsipas saved two match points to beat defending champion Alexander Zverev 3-6, 7-6 (13/11), 6-4 and reach the semi-finals of the Toronto Masters. The Greek teenager, who turns 20 on tomorrow's final day, defeated his third straight top 10 opponent at the tournament after knocking out Dominic Thiem in the second round and 13-time major winner Novak Djokovic in the third. Tsitsipas is the youngest player to post three top 10 wins at a single tournament since a 19-year-old Rafael Nadal at Monte Carlo in 2006. He will next face Wimbledon runner-up Kevin Anderson, who beat Grigor Dimitrov 6-2, 6-2. "I'm confused now, is this real?," 27th-ranked Tsitsipas said after completing his prestige hat-trick of upsets. The Greek rallied from a set and 5-2 down to turn the tables on Zverev, who had been bidding for a fourth Masters 1000 title. "He started putting some balls into the court. I lost a little bit of concentration, a little bit of rhythm," Zverev said. "Even if I would have won, it wasn't a good match." Tsitsipas broke in the ninth game of the second on the way into a tiebreaker, where he calmly converted on his fifth set point after saving two match points for the second-seeded Zverev. Tsitsipas then salvaged four break points for 2-1 in the third, he traded breaks with the German and saved another trio of break points for a 5-4 lead. He completed the victory after nearly two and a half hours on Zverev's sixth double-fault. "This shows that with dedication and work, dreams do come true," Tsitsipas said. "I can see that it's real — it's happening. "I don't know what happened (in the second set) I just broke him (for 4-5), All along I could feel the crowd support, I knew I was still in the match." Anderson's sweep past reigning ATP World Tour Finals champion Dimitrov was a rematch of their 2014 quarter-final duel in Canada when Dimitrov claimed one of his six wins against the South African. "It definitely was a great match today. I felt I played really well right from the beginning," Anderson said. "Right from the first point till the last, I felt I was in a really good frame of mind, playing the kind of tennis that I knew I wanted to be playing and needed to be playing.