Mardy Fish of the United States withdrew from the U.S. Open because of a rib injury.
The 25th-seeded Fish, of Tampa, Florida, was a quarterfinalist at Flushing Meadows last year.
He had been drawn to face Daniel Koellerer of Austria in the first round. Instead, Koellerer will play Rui Machado of Portugal.
Fish lost in the second round of last week’s hard court tune-up in New Haven, Connecticut.