The Romanian, who will face Jelena Ostapenko on Saturday, was installed as the favourite after retaining her title at the Madrid Open last month and went on to reach another final at the Italian Open the following week.
Halep says she is well aware of the threat of Ostapenko, even if the pair have never played, but will concentrate only on making sure she plays the best match possible. "It's pretty fast, and I think it fits my game pretty well".
One who hits the ball as if she's angry at it.
Both women will be playing the biggest match of their careers as they compete for their first Grand Slam title.
In the final, the Romanian could patiently wear her opponent out, wait patiently for her chance and then sneak in towards the net to win easy points.
In the seventh game, Ostapenko led 15-40 on the Bacsinszky serve and after saving the first, another blazing backhand victor gave Ostapenko the lead.
"It meant a lot to me".
In the Roland Garros 2017, she has executed 245 winners, 26 percent of all the points she has played.
But Bacsinszky pounced as the Latvian's radar misfired to break for 4-3 in the second set before Ostapenko gifted it to her with a double fault on set point.
With so many big names absent from the draw this could be Halep's best chance to land a first grand slam - but that is not all that is at stake.
The recently turned 20-year-old started her run with a comeback victory over Louisa Chirico in the opening round, and she then caused an upset by defeating Olympic gold medallist Monica Puig in straight sets in the second.
"Such a big event", she said.
"In some moments", Ostapenko said, "I felt a little bit tight". "He is so much better".
Olympic champion Monica Puig, one-time grand slam victor Sam Stosur and former world number one Caroline Wozniacki all fell at Ostapenko's feet before she ousted Bacsinszky, but the Latvian says she is yet to fully conquer her nerves.
"Today I'm just gonna have fun with my family and my friends", Ostapenko said of her birthday plans.
She added: "Every match I was playing better and better and I'm really happy to be in the final". She's unseeded and ranked No. 47, but won't be for much longer, she will leap into the Top 20 soon.
Her all-out attacking game has thrilled the Paris crowd and seen off the likes of Sam Stosur, Caroline Wozniacki and, over three sets in the semi-final, Timea Bacsinszky. "I love to play here, I love you guys, you're fantastic, thanks for coming to support me".
But the Latvian took the challenge to Bacsinszky with her aggression, nipping ahead at 4-3 before the Swiss called for the trainer.
After getting roughed up by Thiem, including 6-0 in the third set, Djokovic called the 23-year-old "one of the up-and-coming, rising stars that, of course, is very hungry to beat you and to get his hands on a Grand Slam trophy".