The 32-year-old Swiss star will open tonight at Arthur Ashe Stadium against Slovenian Grega Zemlja in hopes of bouncing back after a second-round exit at Wimbledon -- his earliest Grand Slam ouster since winning his first slam title in 2003 at the All England Club.

“The rankings, they fluctuate a lot, especially if you don’t play so well,” Federer said. “If you play great you move up or go down rather quickly.”