Defending champion Simona Halep made light work of Ukraine's Lesia Tsurenko to reach the French Open last 16.
Romania's Halep, seeded third, needed just 55 minutes to win 6-2 6-1 against the 27th seed.
Tsurenko failed to hold any of her eight service games on Philippe Chatrier.
Former world number one Halep, 27, will face one of unseeded pair Monica Puig and Iga Swiatek for a place in the quarter-finals.
"It was a tough match even if the scoreline does not show it," Halep said. "Every day in my life I have that image of me winning last year in my mind, it was my greatest moment of my career.