Federer needs 5 sets to reach quarterfinals
No. 2 Roger Federer was pushed to the limit last night in his fourth-round match against No. 23 Igor Andreev but won, 6-7 (5), 7-6 (5), 6-3, 3-6, 6-3, in New York. He extended his U.S. Open winning streak to 31 matches. Third seed Novak Djokovic overcame hip, ankle and stomach ailments to top Tommy Robredo, 4-6, 6-2, 6-3, 5-7, 6-3, to reach the quarterfinals. No. 8 Andy Roddick cruised past No. 11 Fernando Gonzalez, 6-2, 6-4, 6-1. Qualifier Gilles Muller beat No. 5 Nikolay Davydenko. Women's second seed Jelena Jankovic and fifth seed Elena Dementieva reached the semifinals, winning in straight sets.