Gonzalez beat Juan Carlos Ferrero of Spain 6-2 6-1, Moya defeated Germany's Denis Gremelmayr 6-1 6-4 and 13th-seeded Berdych downed Russian Mikhail Youzhny 7-6 (3) 6-4.

BBC: Federer has won 58 of his 62 matches in 2006

Both Spaniard Moya and fourth-seeded Grosjean had had byes in the first round of the claycourt tournament.

BBC: Seeds fall in Germany

In other potential quarterfinal pairings, fourth seed Tim Henman of Great Britain would face fifth seed Juan Carlos Ferrero of Spain and Spanish third seed Carlos Moya would meet seventh-seeded German Rainer Schuettler.

CNN: Venus set to face Henin-Hardenne