In addition to Halep v Muguruza, the other women's semifinal is the first at the French Open featuring two Americans in 16 years: No 10 Sloane Stephens against No 13 Madison Keys in a rematch of last year's US Open final.
Stephens, meanwhile, produced one of the comeback stories of 2017 as she fought back from a foot injury to lift her maiden Slam title at the US Open.
Halep was my pick to win the French Open, and I truly hope she finally gets the money off her back.
Muguruza, who won the title in 2016, will play top seed Simona Halep for a place in Saturday's final.
- When she was a teenager, Halep underwent breast reduction surgery for personal comfort and to ease her movement around the court.
In her first Grand Slam since the memoir came out last September, Williams called the book "100 percent hearsay", referring to the sections about her, which primarily focus on the 2004 Wimbledon final.
Halep has lost three previous Grand Slam finals, including two at Roland Garros in 2014 and 2017. So like I said, making the quarter-finals here was a big deal for me.
"While the Romanian does have a slight edge throughout their careers, anything can happen in the French Open finals". I have just to play like I did yesterday (against Muguruza).
Stephens, who had never gone past the fourth round in Paris, will take on twice French Open runner-up and world number one Simona Halep of Romania in Saturday's final.
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And even if I repeat it, I played the best match here.
But the extra matches eventually took their toll after such a long absence and Durie questioned why the former world No 1 made a decision to play in both events. It would be very unusual, I think, if I didn't write anything about her.
Sharapova improved with each round of her quarterfinal run, but ran out of steam against Garbine Muguruza. But she failed to convert any of those, and Halep held there, before breaking at love to end it.
Muguruza, a two-time major champion who was coming off a lopsided victory against Sharapova, took quite a while to get going against Halep, who managed to keep sending ball after ball back over the net.
Keys made it to the semis with a straight-sets win over Kazakhstan's Yulia Putintseva while reigning US Open champion Stephens eased past Russia's Daria Kasatkina.
"Kind of a weird day", Muguruza said.
It was a gutsy hold which proved pivotal in the match - and, if Halep goes on to win the final, in her career. Stephens has now followed that up by once again defeating Keys to reach the final in Paris.
"I hadn't had a withdrawal in - I don't know how long. maybe like six years or something", Sharapova said. Some of those matches were very defining for me. Prediction: "Stephens in three sets". She said she expected an intense match against Sharapova, and, in a way, it was - intensely straightforward and efficient.