Top-seeded Feliciano Lopez serves 10 aces in overpowering Gonzalez in thin air in Quito

Top-seeded Feliciano Lopez of Spain hit 10 aces in defeating Alejandro Gonzalez of Colombia 7-5, 6-2 to reach the Ecuador Open quarterfinals on Thursday.

Lopez, coming off a fourth-round effort at the Australian Open, avenged a loss to Gonzalez last April in Houston.

The Quito event is the first in a month of ATP and WTA clay-court tournaments across Latin America. Quito is at 2,800 meters (9,350 feet), a challenge for players unaccustomed to the thin air in the Andes.