Dustin Johnson plays down Wells Fargo chances on return from injury

The US Open champion slipped on a small set of stairs as he went to move his car and landed heavily on his back and left elbow.

World number one Dustin Johnson has low expectations ahead of his first competitive appearance since being forced to withdraw from the Masters last month.

Johnson, who was the pre-tournament favourite after winning his previous three events, suffered a back injury in what he termed a ''freak accident'' at his rented house in Augusta on the eve of the year's first major.