Back to drawing board for stunned Swiss

Shaken by his shocking US Open quarterfinal loss to Tomas Berdych, world No 1 Roger Federer is going "back to the drawing board" to try to pick up the pieces of a suddenly shattered season.

"I've got to go back to the drawing board from here and see what's really a priority," Federer said. "I'm disappointed. I really expected myself to play better."

Federer saw his 21-match unbeaten run in night matches at Arthur Ashe Stadium snapped by a rival whom he had beaten in 11 of 15 prior meetings, one who had never played a night match in the largest Grand Slam tennis venue.