The Dutchwoman once again went 4-1 up in the decider, as Halep conceded 10 successive points, before closing out the match.
She controlled the first set on Sunday and had a chance to close it out, leading 6-5 in the tiebreaker.
She will move up to a career-high 13th in the world rankings. That's why maybe I was able to win. So I was there.
"I had match ball, so I was there", Helep said. I tried to return, and I think I did it pretty well today. "It will be a hard match, but we are both very confident". That's why the end I couldn't make it anymore. "But I also take the positive from these two weeks". It was her third title on the year, winning her others at Roland Garros and Shenzhen.
"This year was much better, and my tennis was much better". Then I said to myself, 'No, I can do this.
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His determination showed in the first set.
"I'm not proud when I break the racket, especially I know there are kids around and watching and I'm not proud of it", he said. So, yeah, I was still confident. "I've put myself in a good position in the semifinals".
The uprush of emotions for Bertens was evident as she cried on coach Raemon Sluiter's shoulder after the match.
Bertens, who played and won two matches on Friday after rain interruptions this week, looked the fitter of the two players in hot, humid conditions.
Halep then took her winning streak to eight matches with a 6-4, 6-1 win over Tsurenko, who had triple break point to take a 5-1 lead in the first set but could not capitalise and the match then swung away from her. "I just couldn't really jump at all". Djokovic is trying to become the first player to win all nine events since the series started in 1990.
Now, the French Open champion eyes action at the upcoming US Open.