Dustin Johnson, left, walks with Phil Mickelson on the third fairway during a practice round for the Masters golf tournament Tuesday, April 8, 2014, in Augusta, Ga. (AP Photo/Chris Carlson)
Dustin Johnson shows his ball after making par on the 14th hole during the second round of the Cadillac Championship golf tournament on Friday, March 7, 2014, in Doral, Fla. (AP Photo/Wilfredo Lee)
Dustin Johnson watches his putt on the 18th green during the second round of the Cadillac Championship golf tournament Friday, March 7, 2014, in Doral, Fla. Johnson bogeyed the hole. (AP Photo/Wilfredo Lee)
Dustin Johnson takes a drop on the ninth hole rough during the first round of the Cadillac Championship golf tournament Friday, March 7, 2014, in Doral, Fla. A severe thunderstorm delayed first round play on Thursday. (AP Photo/Lynne Sladky)
Dustin Johnson watched his shot from the fifth tee during the second round of the Cadillac Championship golf tournament Friday, March 7, 2014, in Doral, Fla. (AP Photo/Lynne Sladky)
Dustin Johnson hits from the eighth tee during the first round of the Cadillac Championship golf tournament Friday, March 7, 2014, in Doral, Fla. A severe thunderstorm delayed play on Thursday. (AP Photo/Lynne Sladky)