Caddy Jim MacKay, right, watches as Phil Mickelson tee off on the fourth hole during a practice round for the Masters golf tournament Tuesday, April 8, 2014, in Augusta, Ga. (AP Photo/Chris Carlson)
Jason Dufner tees off on the fourth hole during a practice round for the Masters golf tournament Tuesday, April 8, 2014, in Augusta, Ga. (AP Photo/Chris Carlson)
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)
Se Ri Pak, of South Korea, hits out of the rough on the second hole during the final round of the Kraft Nabisco Championship golf tournament Sunday, April 6, 2014, in Rancho Mirage, Calif. (AP Photo/Chris Carlson)