keywords: federer semifinals agassi andre seed
text: Federer Survives Agassi Comeback to Reach Semifinals  NEW YORK (Reuters) - Top seed Roger Federer survived a  stirring comeback from twice champion Andre Agassi to reach the  semifinals of the U.S. Open for the first time on Thursday,  squeezing through 6-3, 2-6, 7-5, 3-6, 6-3.