Third-seeded Aryna Sabalenka of Belarus was down a set before rallying past Kateryna Kozlova of Ukraine, 3-6, 6-3, 6-3. Fifth-seeded Caroline Wozniacki of Denmark, the 2011 Volvo champion, won in straight sets, topping Laura Siegemund of Germany 6-2, 6-2 to reach the round of 16 at the season's first clay-court event.
Eighth-seeded American Madison Keys, ranked 18th in the world, rallied from 4-3 down in the final set to oust Germany's Tatjana Maria 7-6 (5), 4-6, 6-4. Ninth-seeded Belinda Bencic of Switzerland and 10th-seeded Jelena Ostapenko of Latvia also advanced.
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