Federer cruises into quarters with win over Kohlschreiber

NEW YORK (AP) Roger Federer took a medical timeout after the second set and otherwise showed no signs of trouble in a 6-4, 6-2, 7-5 victory over No. 33 seed Philipp Kohlschreiber to reach the U.S. Open quarterfinals.

Federer did not face a break point and won in straight sets for the second time in a row after being pushed to five sets in each of the first two rounds. He improved to 12-0 for his career against Kohlschreiber.

During the on-court interview at Arthur Ashe Stadium afterward, Federer said with a laugh that the break before the third set Monday night was because he ''just needed a bit of a rub on my back or my bottom and I didn't want to do it on court.''

The No. 3-seeded Federer will face Juan Martin del Potro in the quarterfinals. They met in the 2009 U.S. Open final, when del Potro won his only Grand Slam title and ended Federer's run of five championships in a row in New York.