CARLSBAD, Calif. -- Top-ranked Serena Williams withdrew from next week's JP Morgan Chase Open due to a strained left quadriceps, the third straight tournament she will miss due to injury.

Tuesday's announcement by the WTA Tour comes a day after Williams pulled out of the Acura Classic. She also withdrew from the Bank of the West Classic last week.

Williams, winner of five of the past six Grand Slam titles, had an MRI performed on her left leg Monday in Los Angeles and was advised not to play this week. The quadriceps injury was causing Williams considerable pain in her left knee.

Williams missed the Bank of the West Classic because of pain in her left knee not associated with her strained quadriceps.