Roger Federer is sliding in the ATP rankings, now down to No. 7.
Federer, who spent more weeks at No. 1 than anyone, already had reached his lowest spot in a decade by dropping to No. 5 after Wimbledon -- and he fell two more places Monday.
Federer will be seeded seventh at the U.S. Open, where he won five of his 17 Grand Slam titles.
In other changes, French Open champion Rafael Nadal -- who won hard-court titles at Montreal and Cincinnati the last two weeks -- rose to No. 2 from No. 3, swapping places with Wimbledon champion Andy Murray. Novak Djokovic remained No. 1.