Golfer Tiger Woods says he aggravated a previous injury to his left knee and leg last week but still hopes to play in next month's U.S. Open.
Woods withdrew from The Players Championship after nine holes Thursday, shooting a 6-over 42 on the front side at TPC Sawgrass.
Woods said on his Web site Monday he aggravated the knee on his opening tee shot, and that in turn caused flare-ups in his left calf and Achilles -- injuries he first incurred during an awkward swing at the Masters.
Woods indicated he will use rest, cold-water therapy and soft-tissue treatment to treat the injuries but added there's no timetable for his return.
"Aggravating my injury is very disappointing," Woods wrote. "I'll do whatever is necessary to play in the U.S. Open, and I'm hopeful I can be there to compete."
The 2011 U.S. Open is set for June 16-19 at the Congressional Country Club in Bethesda, Md.
Woods, a former longtime world No. 1, is now ranked eighth and hasn't won a tournament since the November 2009 car accident that led to revelations of his extramarital affairs.