Big-serving Croats Ivan Ljubicic and Mario Ancic advanced Tuesday to the quarterfinals of the Nasdaq-100 Open. The sixth-seeded Ljubicic hit 13 aces and beat Christophe Rochus 6-3, 6-1 in 55 minutes. Ancic, seeded 22nd, had nine aces and defeated No. 5 Nikolay Davydenko 7-5, 6-4. Ancic lost to Ljubicic in the fourth round at Indian Wells this month.