The news was announced Tuesday, and Johnson explained the injury on his
'First I have to apologize to the fans and sponsors,' he tweeted. '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!'
Johnson, the 12th-ranked player in the world, finished tied for 38th at the
Masters in each of the last two years. His career-best finish was a tie for
30th in 2009, his first appearance in the tournament.
The 27-year-old hasn't played since the WGC-Cadillac Championship in early
March, when he finished tied for 35th. He has three top-10s this season, but
also withdrew from the Humana Challenge in January because of back problems.