Stephens managed to land a couple of late blows, but Halep confidently served it out, sealing victory on her first match point when her opponent netted a return.
"It was incredible and thank you for your support", she told the crowd - most of whom appeared to be backing her - on court Philippe-Chatrier.
"I see the Romanian flag in the crowd, thanks to my friends and my family and to all the Romanian and French fans, I have felt your support over the last two weeks".
"I will try my best", Halep told the crowd at Court Philippe Chatrier, "and hopefully I will be better than previous year".
"I'm really happy it's happened in Roland-Garros in Paris - my special city". "But I believe in my chance".
While Halep's slump from a set and 3-0 up against Jelena Ostapenko at Roland Garros was in the full glare of the world's media, Stephens's own professional crisis was more private but just as devastating.
"You can't even script this remarkable 12-month journey for Simona Halep".
"I think tomorrow is a bigger moment for Simona Halep than it is for Sloane Stephens", Evert, a Eurosport analyst, said on Friday.
Halep, now with momentum on her side, continued to push forward and broke Stephens' serve in the very first game of the third set.
The live telecast of the Simona Halep vs Sloane StephensFrench Open women's singles final is scheduled to begin at 6:30 pm IST.
Simona Halep had been at the precipice of a Grand Slam. There's no one else I'd rather lose to than the No. 1 in the world'. Her third defeat with a major title on the line came against Caroline Wozniacki at the Australian Open in January. Last season was one to forget and Halep became more determined to make up for the shortcomings and od much better in 2018.
But she was beaten by Stephens' brilliance, not herself, in the opening set. Stephens did not get on the board in the third set until the sixth game. "I just have to start to relax and enjoy the match".
"I have been dreaming for this moment since I started playing tennis".
When Stephens led by a set and 2-0, though, it appeared as if she would improve to an unblemished 7-0 in finals.
She was rewarded with a break in the second and fourth games to take a 4-0 lead looking totally in charge of proceedings. That was not the case in the first though as Stephens, the first American not called Williams to reach the French Open final since Jennifer Capriati triumphed in 2001, played flawlessly. Halep looks for the second title of the year and her 17th title of her career.
He had threatened to stop working with her, saying that Halep's negative body language and attitude were standing in her way.
Halep beat Stephens the last four times they played each other. Halep is a three-time runner-up at majors, including in Paris in 2014 and 2017. Of her first 14 points, 13 arrived via errors by the Spaniard - nine unforced, four forced.
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