Pro golfer Dustin Johnson injured his lower back after falling down a staircase, ultimately causing him to back out of the Masters tournament. Johnson's Manager David Winkle Johnson was at an odds of winning 11:2 on Wednesday, but the ranking dropped to 7:1 after the news of his fall. Johnson was scheduled to tee off at 2:03 p.m. with golfers Jimmy Walker and Bubba Watson, but withdrew because of his injuries.