Second-seeded Daniela Hantuchova of Slovakia defeated Lourdes Dominguez Lino of Spain 6-3, 7-6 (6) to reach the second round of the Monterrey Open.
Hantuchova next faces Kaia Kanepi of Estonia in the second round.
In a key second-round match, third-seeded Anastasia Pavlyuchenkova of Russian defeated Polona Hercog of Slovenia, 6-2, 6-3. Hercog reached the final last weekend against Venus Williams in Acapulco in the Mexican Open, a clay-court tournament.
Pavlyuchenkova faces Klara Zakopalova of Czech Republic in the quarterfinals.
In other second-round results, Zakopalova defeated Patricia Mayr of Austria, 6-4, 6-3, and Alize Cornet of France ousted seventh-seeded Aleksandra Wozniak of Canada, 6-2, 6-3.
Also in the second round in the outdoor hard-court tournament, American Vania King defeated Julie Coin of France 6-3, 6-3.
Top-seeded Jelena Jankovic of Serbia was upset in her first-round match, losing on Tuesday to Anastasija Sevastova of Latvia 5-7, 6-4, 6-4.
