Dustin Johnson studies his second putt on the 18th green during the first round of the WGC-Cadillac Championship in Doral, Fla., Thursday, March 5, 2015.
Dustin Johnson studies his second putt on the 18th green during the first round of the WGC-Cadillac Championship in Doral, Fla., Thursday, March 5, 2015. J Pat Carter AP
Dustin Johnson studies his second putt on the 18th green during the first round of the WGC-Cadillac Championship in Doral, Fla., Thursday, March 5, 2015. J Pat Carter AP