Swiss 30th seed Bacsinszky, celebrating her 28th birthday with a second semifinal appearance in three years in Paris, broke Ostapenko for an early 2-0 lead. She is the first unseeded player to reach the women's singles final here since 1983.
It didn't help that she tweaked her right thigh in the first set. "I love to play here".
Halep showed the full extent of her defensive skills to beat Pliskova and reach her second French Open final. It quickly improved, however, and she mostly cruised through to the quarterfinals before her comeback against Svitolina.
Pliskova refused to go down without a fight and broke back to trail 4-3 with yet more strong hitting, but Halep was on a mission and regained her advantage courtesy of another stray forehand from the Czech before serving out the match.
Jelena Ostapenko celebrated the ideal birthday present with a spot in her first grand slam final.
Bachinski took advantage of the failure of her rival and leveled the score in sets.
Pliskova has been critical of her own performances at this French Open, specifically referring to her backhand and inconsistency on her potentially big serve.
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Ostapenko trained as a ballroom dancer for seven years but seems more suited to thrashing the fluff off of tennis balls.
Ostapenko won the first set 7-6 (4). "And now it's close, but it's close and it's far, as well, because I'm playing against somebody who I would (call) one of the best girls on clay".
"I am truly happy and can not believe what I have achieved, " she said after her win over Caroline Wozniacki yesterday.
On Thursday, she will face No. 2 Karolina Pliskova of the Czech Republic, a 7-6 (3), 6-4 victor over No. 28 Carolina Garcia of France.
Suddenly, Halep had to defend, something she does with poise and grace, but Pliskova had recovered her forehand and it made all the difference as she cracked a victor to seal the second set. Ivanovic won the title at the French Open the next year.
A three-time champion at Roland Garros, Kuerten will be honored before Sunday's final when he will receive his Hall of Fame ring during a ceremony marking 20 years since he won his first title in Paris. This time I think I gave my very maximum.
Serena Williams, the 23-times major champion, is pregnant, double Wimbledon champion Petra Kvitova is just back after being stabbed, five-times major champion Maria Sharapova has only recently returned from a doping ban and former world number one Victoria Azarenka has been out after having a baby.