Roger Federer says he will reassess his fall plans after being upset by Tomas Berdych at the U.S. Open.

“So many moments I thought, ‘Man, it's just not happening for me.' It was just a very disappointing match for me,” Federer said. “I've got to go back to the drawing board from here and see what's really the priority, if [finishing No. 1] a priority for the end of the year. So I don't know right now. I mean, the goal has been achieved, but now this is disappointing for me. We'll see where I go from now and if I go to Davis Cup [next week] or not, about what's to come for the remainder for the season. No. 1 has another a role to play, but this obviously is a setback. But again, season is not over. I hope to finish strong at the end, and particularly in the indoor season then.”