Juan Martin del Potro def.
The men's singles No 1 seed will be back on court at 11am United Kingdom time to resume his quarter-final clash with Diego Schwartzman, of which they have yet to complete the second set. Two of the four matches have gone the distance.
It was also a match which witnessed a colossal 99 unforced errors.
The key for Nadal to keep his semifinal record flawless will be recovery. It's different match, different year.
In all, Keys made 41 unforced errors, 30 more than Stephens.
The 2012 and 2014 Paris champion, who missed the 2016 tournament because of a doping ban and a year ago when she was refused a wild card, was broken six times, committed 27 unforced errors and won just five points on her own serve in the second set. I had two double faults, so it was a bit tough.
Keys has reached the second week in nine of her last 11 Slams.
Halep secured an early break in the second and did not relinquish it despite some fierce pressure from two-time major victor Kerber, with one remarkable get at the net even prompting applause from the German.
Halep has been put through the wringer in her past two matches.
But even so, Muguruza believes her three-time Grand Slam finalist opponent is the favourite to pick up two more wins this week and break her duck.
"I have just to stay strong, to try to make her uncomfortable on court", Halep said, "and to try to play my game". I just want to go there and try to keep my tactic and keep my positive things every second.
"When you're facing somebody that also has an aggressive style of game I think it's about who takes the command, who takes the first opportunity", Muguruza said.
Halep was the runner-up in 2014 and 2017.
Simona Halep's victory over Garbine Muguruza means Halep will retain the world No. 1 ranking next week.
"I am very pleased to be in another final in Paris", said Muguruza who has yet to drop a set in the tournament and claimed her first win over Sharapova in 4 meetings.
After winning the U.S. Open previous year, Stephens got off to a disastrous start in 2018. Muguruza, the 2016 French Open champion, was world number one for four weeks from September 11 to October 8 past year.
"There is no point to be sad about what happened in Rome, because now it doesn't really matter", Muguruza concluded her pre-tournament press conference - and has been tearing up the Parisian clay with steely determination since.
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