Juan Martin del Potro into quarters
BASEL, Switzerland -- 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.
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