LYON, France — Third-seeded Ivan Ljubicic of Croatia reached the quarterfinals of the Lyon Grand Prix on Thursday by beating Nicolas Kiefer of Germany 6-3, 3-6, 6-3.

Ljubicic, the 2001 Lyon champion, served 27 aces and broke his opponent twice to extend his perfect record against Kiefer to 4-0.

Ljubicic will face Florent Serra of France in his eighth quarterfinal of the year.

Also, former Lyon finalist Marc Gicquel of France upset Paul-Henri Mathieu 6-4, 6-0. The sixth-seeded Mathieu.

Top-seeded Jo-Wilfried Tsonga of France will aim for a quarterfinal berth later Thursday when the Frenchman takes on Olivier Rochus of Belgium. Second-seeded Gilles Simon faces French qualifier David Guez.