On his website, Tiger Woods said he will miss next week's Genesis Open and The Honda Classic, which is set to start Feb. 23. He will determine his next event after his back is reassessed.
Serena Williams withdrew before her semifinal at the BNP Paribas Open on Friday night with a right knee injury, 14 years after her sister Venus did the same thing and triggered an angry reaction from fans that had driven Serena to boycott the tournament.
US Open champion Marin Cilic has withdrawn from the Australian Open with a right shoulder injury.
Keegan Bradley withdrew from the BMW Championship on Saturday due to a potential rules infraction during the first round -- even though a rules official had absolved him of any violation.
Phil Mickelson withdrew from the BMW Championship early Saturday morning, bringing an abrupt end to his worst PGA Tour season in more than 10 years.
Tiger Woods hurt his back during the final round of the WGC-Bridgestone Invitational on Sunday and withdrew after hitting his tee shot on the ninth hole.
