Defending champion Garbine Muguruza was knocked out of the French Open on Sunday after a losing 1-6, 6-3, 3-6 to Kristina Mladenovic of France.
Caroline Wozniacki reached the last eight after ousting 2009 champion Svetlana Kuznetsova. Wozniacki became the first woman through to the quarterfinals as the Danish 11th seed dumped out Kuznetsova 6-1, 4-6, 6-2.
Wozniacki, who made her only other last-eight appearance at Roland Garros in 2010, will meet either Australia's Samantha Stosur or Jelena Ostapenko of Latvia for a semifinal place. "Svetlana's a great player, especially on clay so I knew it wouldn't be easy," said Wozniacki, a two-time US Open runner-up.
Second seed Karolina Pliskova advanced to round four with a 7-5, 6-1 victory over Germany's Carina Witthoeft. Pliskova, who had won just twice in five previous French Open appearances before this year, will face Paraguay's Veronica Cepede Royg for a quarterfinal spot.
World No. 290 and qualifier Petra Martic reached the last 16 with a 6-1, 6-1 win over Latvian 17th seed Anastasija Sevastova. Croatia's Martic, a former top 50 player whose ranking slumped after a back injury sidelined her for 10 months, will face Ukraine's Elina Svitolina.
"When I got injured, my only hope was that I would get a second chance so I can play some of my best tennis again," said Martic. "I still can't believe that I'm sitting here."
Fifth seed Svitolina downed Magda Linette of Poland 6-4, 7-5.
Bacsinszky downs Venus
Switzerland's Timea Bacsinszky qualified for her third successive French Open quarterfinal with a 5-7, 6-2, 6-1 win over 2002 runner-up Venus Williams.
The 30th seed will take on France's Kristina Mladenovic, conqueror of defending champion Garbine Muguruza, for a place in the semifinals.
Bacsinszky's best Grand Slam performance came when she reached the last four at Roland Garros in 2015, losing to eventual champion Serena Williams.
Her victory over Venus means a first-time major champion will be crowned next Saturday.
Ostapenko into history books
Teenager Jelena Ostapenko is the first woman from Latvia to make it to the French Open quarterfinals in the professional era. She beat 2010 runner-up Samantha Stosur 2-6, 6-2, 6-4.
The 47th-ranked Ostapenko is the youngest player in the tournament at age 19.
She compiled a whopping 46-15 advantage in winners against the 23rd-seeded Stosur, who won the 2011 U.S. Open.
Ostapenko now faces former No. 1 Caroline Wozniacki, who is a two-time major finalist.
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