The Spaniard won 72 percent of the points on serve in stopping Slovak Blaz Kavcic 6-2, 7-6 (7-4). Lopez dropped just four points when he got his first serve and had a 10-3 advantage in aces.
Fifth-seeded American Rajeev Ram needed nearly two hours and two tie-breakers to record a straight-set, second-round win. He defeated German Bjorn Phau 7-6 (12-10), 7-6 (7-2).
Also advancing to the tournament quarterfinals Wednesday were No. 8-seeded Frenchman Stephane Robert, who stopped South African Izak Van der Merwe 7-6 (9-7), 6-1, and Jamaican Dustin Brown, who didn't face a break point in his 6-4, 6-4 win over France's Laurent Recouderc.
Wednesday's results set up Friday quarterfinals with Lopez playing Ram and Brown going against Robert.
Copyright 2010 United Press International, Inc. (UPI).