Back Injury Forces Dustin Johnson to Withdraw from Masters

Dustin Johnson, a 5-time PGA Tour winner, has withdrawn from the 2012 Masters due to a "tweaked back."

Johnson made the announcement via his Twitter page: 

"First I have to apologize to the fans and sponsors. With heartfelt regret, I won't be playing in the Masters due to a tweaked back. You have no idea how much I wanted to walk the fairways at Augusta and fulfill what I've been practicing for!! I'll have to root my buddies!"

No details were given about the injury. 

Johnson, who is Dutch Fork High School graduate, is ranked No. 12 in the world.