Roger Federer lost a set for the first time this week but advanced to the second week at Wimbledon by beating Philipp Kohlschreiber 6-3 6-2 6-7 (5) 6-1. Federer was a break up in the fourth set before losing his focus,and two errant forehands cost him the tie-break. That merely extended his Centre Court workout by half an hour. He earned a berth in the fourth round Monday against a familiar foe Robin Soderling. Federer beat Soderling in the French Open final this month to complete a career Grand Slam and win his 14th major title. Now the No 2-seeded Federer seeks his sixth Wimbledon title. He converted only seven of 22 break-point chances and led 4-2 in the third set,before the No. 32-ranked Kohlschreiber played his best stretch of tennis. Federer had a rare display of frustration after he pulled an easy forehand wide trailing 5-4 in the tiebreaker. Kohlschreiber ripped a backhand winner two points later to force a fourth set,but Federer pulled away from there and extended his winning streak to 15 matches. Soderling reached his fourth round here by defeating Nicolas Almagro 7-6 (7) 6-4 6-4. No 22 Ivo Karlovic hit 46 aces and beat No 9 Jo-Wilfried Tsonga 7-6 (5) 6-7 (5) 7-5 7-6 (5). Among the women,two-time champion Serena Williams arrived six minutes late for her match. Otherwise she remained right on schedule,beating Roberta Vinci 6-3 6-4. Williams said she was late heading to the court because she was awaiting an escort. The mix-up didn't rattle Williams,who hit 10 aces and committed only 12 unforced errors to win for the 172nd time in 200 Slam matches. Also,19-year-old Victoria Azarenka made a successful Centre Court debut by beating Sorana Cirstea 7-6 (2) 6-3. Gisela Dulko,who upset Maria Sharapova,was eliminated by No 10 Nadia Petrova 3-6 6-3 6-4. Seventh-seeded Vera Zvonareva pulled out before her match against No 26 Virginie Razzano. Fourth-seeded Elena Dementieva cruised past qualifier Regina Kulikova 6-1 6-2.
