US Open tournament director David Brewer announced Sharapova's exit, which allowed qualifying lucky loser Daria Kasatkina of Russia into the draw in Sharapova's place.
"Unfortunately I will not be able to compete in this years US Open," Sharapova said in a Twitter posting yesterday. "I have done everything possible to be ready but it was just
not enough time.
"To all my amazing fans, I will be back in the Asian swing in a few weeks and look forward to finishing the year healthy and strong."
Sharapova had not played a match since losing to Williams in a Wimbledon semi-final last month because of the injury, which she said had been a day-to-day thing since it happened.
"Dealing with these nagging things, it's almost like a day-to-day process," Sharapova said on Saturday. She also said, "When you are facing something with the body it's always a day-to-day process".
Williams is 18-2 all-time against Sharapova and has won their past 17 meetings in a row. Prior to pulling out of the tournament for the second time in three years, Sharapova described the injury as 'just a muscle strain'.

"It's always the adjustment of being a professional athlete in a sport that requires many weeks out of the year to compete at a high level," Sharapova said. "Don't always know where some things come from but sometimes you have to make adjustments to be healthy and ready for the big ones. It only gets tougher as you get older," she added.


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