MONTERREY, Mexico (AP)—Second-seeded Anastasia Pavlyuchenkova of Russia defeated Melanie Oudin of the United States 6-2, 7-6 (6) on Wednesday to reach the quarterfinals of the Monterrey Open hard-court tournament.

Top-seeded Jelena Jankovic of Serbia got off to a confident start to her tournament, downing Spain’s Lourdes Dominguez Lino 6-4, 6-1 in a first round match.

No. 8 Polona Hercog of Slovenia also reached the quarterfinals, defeating Barbora Zahlavova Strycova of the Czech Republic 6-4, 6-7 (4), 6-2.

No. 6 Sara Errani of Italy was knocked out in the second round, beaten by Greta Arn of Hungary 4-6, 7-5, 6-4.

In a late first round match, Argentina’s Gisela Dulko eliminated No. 7 Iveta Benesova of the Czech Republic 6-2, 7-6 (3).