Former Wimbledon runner-up Tomas round winners Wednesday at the $1.6 million ABN AMRO World Tennis Tournament.

The second-seeded Berdych blew past Czech Lukas Rosol 6-4, 6-2, while a third- seeded del Potro held off French left-hander Michael Llodra 6-4, 6-7 (3-7), 6-4 on the indoor hardcourts at Ahoy Rotterdam.

Berdych titled in France two weeks ago.

Finnish veteran Jarkko Nieminen reached the quarterfinals here with a 6-3, 5-7, 7-6 (7-2) second-round victory over Poland's Lukasz Kubot.

Additional opening-round wins came for Cypriot Marcos Baghdatis, Russian Alex Bogomolov Jr. and Slovakian qualifier Karol Beck. The former Australian Open runner-up Baghdatis got past German Matthias Bachinger 7-6 (7-2), 6-2 on Day 3.

Wednesday's schedule also features a match for top-seeded former world No. 1 Roger Federer, who will face Frenchman Nicolas Mahut in his opener. Federer was the Rotterdam titlist the last time he played here back in 2005.

The 2012 Rotterdam winner will collect $385,000.