Italy's Sara Errani won the first eight games and the last four to oust 2009 champion Svetlana Kuznetsova from the French Open, 6-0, 7-5.
Errani, seeded 21st, made her second straight Grand Slam quarterfinal on Sunday, where she'll face 10th-seeded Angelique Kerber, a 6-3, 7-5 winner over Petra Martic.
On a blustery day at Roland Garros, the 26th-seeded Kuznetsova committed 14 unforced errors to only four for Errani during a first set that lasted only 30 minutes.
Kuznetsova, who defeated third-seeded Agnieszka Radwanska to reach the fourth round, broke serve to take a 5-3 lead in the second but dropped four straight games to close things out. That leaves Li Na as the only former French Open champion left in the women's draw.