Bacsinszky, a semifinalist here in 2015, will next meet either Jelena Ostapenko or Caroline Wozniacki.
On a rainy day at the French Open, Timea Bacsinszky, the 30th seed Swiss, reached the women's semi-finals with a 6-4, 6-4 win over local 13 seed Kristina Mladenovic.
Ostapenko will play Timea Bacsinszky for a place in her first Grand Slam final after the 30th-seeded Swiss ended the title aspirations of France's Kristina Mladenovic, 6-4, 6-4.
The world number 47 said: "I didn't expect that it would be here in Paris, but I'm really happy it's here".
Rafael Nadal and Novak Djokovic's quarterfinal matches were postponed until Wednesday following torrential rain in the French capital. "At this point, I think it's important for me to try and get ready for the French Open and be 100% for that", said Wozniacki a few weeks ago. A couple of her fellow 1997-born players have perhaps had better results sooner than her at the Slams but she has caught up and gone even further. Upon resumption, the Frenchwoman fought off the break and roared ahead 3-1, but her joy was short-lived as Bacsinszky found her range once again, striking winners off both wings. Going in, she's tough to read, you don't really feel comfortable.
Wicked winds bent the flag poles and red brick dust was whipped up into the players' eyes in the opening games in which Ostapenko could hardly locate the court.
Eleventh seed Wozniacki's wait for a first grand slam continues on after she was dumped out six hours after the quarter-final started as poor weather led to one lengthy delay at the end of the second set and another soon after the players had resumed.
"It was really hard because we had all the seasons rolled into one today", Bacsinszky said of a day that saw rain and hail. They play Thursday, which happens to be Ostapenko's 20th birthday and Bacsinszky's 28th.
Whatever the main reason is - or probably a combination of all of them - there will be a new women's champion at the French Open, and that victor might just be Caroline Wozniacki this time. Wozniacki has won five of her last seven matches on clay court.
She certainly needed quick footwork to handle the bad wind that wreaked havoc on her quarter-final with Caroline Wozniacki on Tuesday.
Before last week, she had never been past the third round of any Grand Slam tournament.
- Ostapenko when asked if her ballroom dancing competitions as a youngster helped prepare her for the big stage in tennis.
"The drills we were doing were all very basic, but we spent a lot of time on the court".
In his quarterfinal, nine-time French Open champion Nadal faces No. 20 Pablo Carreno Busta; defending champion Djokovic plays No. 6 Dominic Thiem in a rematch of a 2016 semifinal won by the Serb in straight sets.
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