American Jessica Pegula, the No 3 seed, edged out Kazakh Elena Rybakina 2-6, 6-3, 7-6 (8) to reach the last 16 of the Guadalajara Open at the Centro Panamericano de Tenis on Wednesday night.
Pegula, ranked No 5, will face Canadian Bianca Andreescu next.
In the previous round, Rybakina, ranked No 24, won against Czech Karolina Pliskova (7-6 (5), 6-2).
Guadalajara WTA 1000, other second-round results (Centro Panamericano de Tenis, hard, USD 2.527.250, most recent results first):
- Paula Badosa vs. Victoria Azarenka
- Belinda Bencic vs. Sloane Stephens
- Ajla Tomljanovic vs. Madison Keys
- Camila Osorio vs. Marie Bouzkova: wednesday
- Veronika Kudermetova (8) beat Donna Vekic (WC): 6-4, 7-5
- Coco Gauff (5) beat Elisabetta Cocciaretto (Q): 7-6 (1), 6-3
- Anna Kalinskaya beat Elise Mertens: 6-4, 0-6, 7-5
- Martina Trevisan beat Katerina Siniakova: 6-0, 4-6, 6-3
- Liudmila Samsonova beat Aryna Sabalenka (2): 6-4, 2-6, 6-2
- Danielle Collins (14) beat Magdalena Frech (Q): 6-3, 6-4
- Jelena Ostapenko (12) beat Eugenie Bouchard (WC): 7-5, 2-6, 6-1
- Caroline Garcia (6) beat Rebecca Marino (Q): 6-7 (2), 6-3, 7-6 (5)
- Daria Kasatkina (7) beat Lin Zhu: 6-1, 6-2
- Maria Sakkari (4) beat Marta Kostyuk: 6-4, 6-4
- Bianca Andreescu beat Petra Kvitova (16): 3-6, 6-2, 6-0