Del Potro eases into Swiss Indoors quarterfinalsFrance's Paul-Henri Mathieu returns a ball to Russia's Nikolay Davydenko during their round of sixteen match at the Swiss Indoors tennis tournament at the St. Jakobshalle in Basel, Switzerland, on Thursday, Oct. 25, 2012. (AP Photo/Keystone/Georgios Kefalas)
BASEL, Switzerland (AP) -- Juan Martin del Potro of Argentina had 10 aces in defeating Brian Baker of the U.S. 7-5, 6-1 Thursday to advance to the Swiss Indoors quarterfinals.
Del Potro, seeded second, plays Kevin Anderson of South Africa in Friday's quarters. Anderson beat Marinko Matosevic of Australia 6-3, 6-7 (5), 6-3.
Top-seeded Roger Federer has a quarterfinal against Benoit Paire of France, who on Thursday downed Lukasz Kubot of Poland, 6-4, 6-4.
In other second-round matches, sixth-seeded Mikhail Youzhny of Russia beat Matthew Ebden of Australia, 6-3, 6-1, and Paul-Henri Mathieu of France ousted Nikolay Davydenko of Russia 6-3, 6-7 (2), 6-4.