"It was a tough start. I wanted to do too much in the match. It was tough because her ball is very low, and you don't have many chances to finish the points from there.

"Actually, I want to forget those games," Halep said with a smile. "It was not exactly what I wanted to play at the beginning, but I just didn't feel it. Then I changed it and it was much better."

Muguruza conceded just three games to race past Russia's Maria Sharapova 6-2, 6-1 in 70 minutes, remaining as the only player in women's draw that has never dropped a set.

Two-time winner Sharapova, who made her return to Roland Garros after three years, failed to challenge the Spaniard throughout the match, and she easily conceded their first duel in four years.

"Being aggressive is a part of my game. When you're facing somebody that also has an aggressive style of game, it's about who takes the command, who takes the first opportunity," said Muguruza.

"I just didn't feel free, and I felt there was a lot of force behind all the shots and that it wasn't coming natural to me. I didn't have the rhythm," Sharapova pointed out.

Chinese youngsters fared in two directions in junior division, as eighth-seeded Wang Xiyu powered past Maria Lourdes Carle of Argentina in straight sets, while No. 2 seed Wang Xinyu and Zheng Qinwen both crashed out from girls' singles third round.

Madison Keys and Sloane Stephens will put on an all-American women's singles semifinal on Thursday.

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