Jannik Sinner, the world No. 14, defeated Stan Wawrinka 6-1, 6-3 to reach the semifinals in Rotterdam for the first time.

The Italian is on a six-match winning streak after winning Montpellier last week.

Though he is unseeded in the event, Sinner defeated world No. 3 Stefanos Tsitsipas in the second round for his first career Top-3 win.

Sinner, age 21, is seeking his second career ATP final after becoming the first teenager to win an ATP 500 title in 2021 Washington.

In Friday’s match with 2015 champion Wawrinka, Sinner broke the Swiss’s serve in the opening game and saved three break points on his own serve to lead 2-love. He raced through the rest of the first set, in which he converted three of five break points.

In the second set, Wawrinka found more energy and was much better. Sinner had to work harder, but the Italian remained dominant off the Swiss’s second serve and was able to break for 5-3 to serve for the match. It took three match points for the victory, when Wawrinka missed a forehand long.

For the match, Sinner struck 11 winners and 17 unforced errors. Wawrinka struck six winners and 29 unforced errors. Sinner served four aces and no double faults. Wawrinka served 2 aces and one double fault.

Sinner said in an interview with Tennis TV: “It was for sure a tough match. We know each other quite well. We practice a lot together. He’s a very nice guy.

“I’m very happy to be in the next round. I tried to push him a lot. He defended very well. He made a couple unforced errors the first set. I tried to get going the momentum, then I made a couple of unforced errors at 3-1. I tried to cancel that game and go on.

“I think it was a good performance today.”

Next up for Sinner in the semifinals is Dutchman Tallon Griekspoor.