Top-seeded David Ferrer led the charge into the quarterfinals at the $850,000 Malaysian Open tennis event.
The world No. 5 Spanish star blew past Russian Alex Bogomolov Jr. 6-4, 6-2 on the hardcourts at Putra Stadium.
Ferrer's quarterfinal opponent on Friday will be Dutchman Igor Sijsling, who upset fifth-seeded Spaniard Feliciano Lopez 7-6 (7-0), 7-6 (7-2) on Day 4.
In other second-round action involving seeds, No. 2 Juan Monaco of Argentina handled Taiwanese wild card Jimmy Wang 6-4, 7-5, No. 3 Japanese Kei Nishikori came from behind to beat Spaniard Albert Ramos 6-7 (5-7), 6-2, 6-1, and Colombian Alejandro Falla upended No. 4 Alexandr Dolgopolov of Ukraine 6-3, 3-6, 6-3.
The top-four seeds all received opening-round byes this week.
One other second-round affair saw former top-five Russian star Nikolay Davydenko straight-set Uzbekistan's Denis Istomin 7-5, 6-4.
Friday's other quarterfinals will pit Monaco against Canadian Vasek Pospisil, Nishikori versus the 2009 Kuala Lumpur champion Davydenko and seventh-seeded Frenchman Julien Benneteau against Falla.
The winner of this $850,000 tournament will collect $153,400.