NEW YORK, Sept 5 (Reuters) - Five-times U.S. Open winner Roger Federer took another straight-sets step at the 2015 championships with a 6-3 6-4 6-4 third-round victory over Philipp Kohlschreiber at Flushing Meadows on Saturday.
Federer lost his serve for the first time in the tournament as Kohlschreiber broke him twice in the 93-minute match, but the 34-year-old Swiss stayed in command with five service breaks of his own to improve his career record to 10-0 against the German.
“I think I won the big points today,” said 17-times grand slam singles winner Federer. “I served well when I had to at the end.”
Federer, who had sprinted through his first two matches with the loss of only nine games, next meets big-serving American John Isner.
The 13th-seeded American advanced when Czech Jiri Vesely retired when trailing 6-3 6-4.
Reporting by Larry Fine; Editing by Andrew Both