Elena Rybakina, Marketa Vondrousova into Stuttgart quarters, Ons Jabeur out
Rybakina battled her way to a roller coaster 7-6 (3), 1-6, 6-4 victory over Veronika Kudermetova, and will face Jasmine Paolini after the Italian upset seventh-seeded Ons Jabeur 7-6 (8), 6-4.