AUGUSTA, Georgia, April 5 (Reuters) - World number one Dustin Johnson's participation in the U.S. Masters this week is in doubt after he injured his back in a freak accident, his manager David Winkle said on Wednesday.
Johnson is favourite to win the Masters title after victories in his last three tournaments.
"At roughly 3:00 pm today, Dustin took a serious fall on a staircase in his Augusta rental home," Winkle said in a statement.
"He landed very hard on his lower back and is now resting, although quite uncomfortably. He has been advised to remain immobile and begin a regimen of anti-inflammatory medication and icing, with the hope of being able to play tomorrow. I will refrain from commenting further until I know more about Dustin's condition."
(Reporting by Ed Osmond, editing by Steve Keating)