Juan Martin del Potro set up a French Open quarter-final against Roger Federer by finishing off a 7-6 (6), 1-6, 6-3, 7-5 victory over Tomas Berdych on Monday in a match stopped the night before because of darkness after three sets.
The No. 9-seeded del Potro broke No. 7 Berdych at love in the final game.
Del Potro is 2-11 against Federer, but one of the victories came in the 2009 U.S. Open final, when the Argentine won his only Grand Slam title.
One of del Potro's losses to Federer was in the 2009 French Open semi-finals. That's the only time del Potro made it that far at Roland Garros.
Berdych was a French Open semi-finalist in 2010, then was the runner-up at Wimbledon later that year.