Elina Svitolina will face Jil Teichmann in the Internationaux de Strasbourg quarter-finals after overcoming Magda Linette on Tuesday.
Anastasia Pavlyuchenkova battled into the second round at Strasbourg with a 6-3 7-5 win over Alison Van Uytvanck on Sunday.
Jet lag could not hold back Elena Rybakina as she gained revenge over Ekaterina Alexandrova in Rome on Monday.
In her first WTA Tour match since February, Simona Halep was made to work hard for victory by Polona Hercog at the Prague Open.
Former world number one Garbine Muguruza discussed her renaissance after advancing to her first grand slam semi-final since 2018.
Former world number one Garbine Muguruza moved through to her first major semi-final since the 2018 French Open on Wednesday.
Simona Halep and Garbine Muguruza marched into the last eight on Monday, as Angelique Kerber fell to Anastasia Pavlyuchenkova.
More seeds were sent crashing in the Australian Open on Saturday as Karolina Pliskova and Elina Svitolina suffered straight-set defeats.
Saturday saw another Australian Open women's singles contender, Karolina Pliskova, fall in the third round.
The door is open for Belinda Bencic to qualify for the WTA Finals after Kristina Mladenovic's defeat of Kiki Bertens in Moscow.