Greg Norman has withdrawn from the Jeld-Wen Tradition tournament because of a sore back.
The Tradition, the fourth of five majors on the Champions Tour, got under way Thursday at Crosswater Golf Club in central Oregon.
It would have been Norman's first appearance in the event, and sixth start on the Champions Tour this year.
The Hall of Famer from Australia, who joined the tour for senior golfers in 2005, won 20 times on the PGA Tour. Known as the Shark, Norman was the world's top-ranked golfer for 331 weeks during the 1990s.