Aug 20 (Reuters) - Frenchman Jo-Wilfried Tsonga has withdrawn from the U.S. Open due to a long-term knee problem, the United States Tennis Association said on Monday.
Tsonga, three times a quarter-finalist at Flushing Meadows, has not played since a semi-final defeat at the Open Sud de France in February. He had knee surgery in April.
The 33-year-old, now ranked 64 in the world, will be replaced in the main draw by Australian James Duckworth.
The season’s final grand slam begins on Aug. 27 in Flushing Meadows. (Reporting by Steve Keating in Toronto; Editing by Ken Ferris)