"I don't feel I'm favorite for this match, because she's played better than I have this year", Muguruza said of her next match against Halep.
Muguruza made light work of Sharapova as she utterly dominated their quarter-final.
Top-ranked Simona Halep has leveled at one set-all in her French Open quarterfinal against Angelique Kerber of Germany.
Muguruza broke early in the second set and was so strong on serve that a Sharapova comeback never looked likely.
"I think I have to put a lot of things in perspective for the last, what, four, five weeks since the clay season", Sharapova said after a 6-2, 6-1 defeat to Garbiñe Muguruza in the last eight in Paris.
Nadal was broken three times and lost the opening set of his quarterfinal Wednesday against 11th-seeded Diego Schwartzman of Argentina by a score of 6-4.
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Maria Sharapova served six double-faults and had 27 unforced errors in the straight sets loss to Garbine Muguruza. In Open Era, No.1 seed has claimed the Roland Garros title on 18 occasions and finished runner-up 13 times.
Sharapova, back at the claycourt slam for the first time since 2015 following a doping-ban, walked on court with two French Open crowns to Muguruza's one and a 3-0 head-to-head record against the reigning Wimbledon champion. She broke again in the eighth game to seal the match.
"I think it would be unusual for me not to include someone that I have competed against for so many years", said the 31-year-old. That includes the French Open in 2014 and 2017, and the Australian Open in January.
Now third in the WTA leaderboard behind Halep and Caroline Wozniacki, Muguruza will rise above them both to sit atop of the rankings with a win on Thursday. Muguruza sensed weakness and pounced for a 4-0 lead.
Sharapova didn't need to play a point in the fourth round, because Serena Williams pulled out of their much-anticipated match with an injured chest muscle.
Halep got off to a poor start, with 10 unforced errors in the opening three games handing Kerber a double break. Muguruza essentially got that round off, too: Her opponent, Lesia Tsurenko, retired with an injury after only two games. Some of those matches were very defining for me. Halep is 3-2 in career grand slam semifinal matches.