An injured back will force Tiger Woods to skip the annual charity event run by his college buddy, Notah Begay III.
Officials at the NB3 Challenge announced Woods' withdrawal from their tournament, which begins Wednesday at the Turning Stone Resort in New York.
"While we're disappointed Tiger is unable to play in this year's event, the important thing for Tiger is to make sure he's 100% healthy and not risk further injuring himself," Begay said in a statement.
Woods has struggled with a variety of ailments this summer. At the Barclays last week, he played the final holes in obvious discomfort and said that he was suffering from back spasms.
The world's top-ranked golfer persevered to finish tied for second and still holds a lead in the FedEx Cup standings. He is expected to compete in the second leg of the playoffs at the Deutsche Bank Championship later this week.