Top-seeded David Ferrer defeated fellow-Spaniard Feliciano Lopez 7-6 (1), 6-2 on Wednesday to advance to his fifth-straight Mexican Open quarterfinals.
Ferrer, trying to win his fourth title on Mexican soil, will next play South Africa's Kevin Anderson, who eliminated American Sam Querrey,7-6 (2), 6-4.
Also Wednesday, Gilles Simon (6) of France beat Donald Young of the United States 6-4, 6-3, Ukraine's Alexandr Dolgopolov downed Frenchman Jeremy Chardy 6-3, 6-4 and Croatia's Ivo Karlovic defeated Dudi Sela of Israel 7-6 (4), 6-2.
On the women's side of the combined ATP-WTA tournament, top-seeded Dominika Cibulkova reached the quarterfinals with a 7-5, 6-2 win over Yanina Wickmayer of Belgium.
"I*m still struggling with my serve, but I got another win so I*m happy", Cibulkova said.
Cibulkova has won her first matches on tour since her run to the Australian Open final and is due to play Marina Erakovic of New Zealand, who defeated Serbia's Bojana Jovanovski 6-1, 6-4.
In other matches, No. 8 seeded Shuai Zhang of China beat Canada's Aleksandra Wozniak 6-1, 6-4; America's Christina McHale knocked out Kimiko Date-Krumm of Japan 7-5, 6-1; Croatia's Ajla Tomljanovic eliminated Victoria Duval of the United States 6-3, 6-0; and Frenchwoman Caroline Garcia downed Sharon Fichman of Canada 6-2, 7-5.