(REUTERS, AFP) - Former world No. 1 Serena Williams has pulled out of next week's US Open, saying on Wednesday (Aug 25) that her torn hamstring has not completely healed ahead of the final tennis Grand Slam of the year.

Williams, a six-time winner at Flushing Meadows, has had an injury-marred season and limped out of her first-round match at Wimbledon in tears due to the leg injury.