Dustin Johnson withdraws from the Masters

Updated: 

Dustin Johnson has withdrawn from the Masters as a result of the back injury he sustained in a heavy fall on the eve of the tournament.

The world number one fell on the stairs at his rental home on Wednesday and was consequently a doubt throughout Thursday, with conflicting reports emerging on the state of his fitness.

Initially, it was reported that Johnson was going to tee off at Augusta and he made his way over to the first tee to begin his round.

However, the American was seen grimacing during his practice swings and shortly after it was confirmed by the PGA Tour that the U.S. Open champion had pulled out of the tournament.

After breaking his major duck at Oakmont last year, Johnson was the favourite to claim victory in Georgia this week having embarked on a three-tournament winning streak.

However, his injury means he will become just the second world number one - after Tiger Woods in 2014 - to miss the Masters.

Johnson's withdrawal means that the final group went out as a two-ball, with two-time champion Bubba Watson playing alongside Jimmy Walker.