Jason Day of Australia, talks during a news conference at the PGA Championship golf tournament at the Quail Hollow Club Wednesday, Aug. 9, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Jason Day of Australia, talks during a news conference at the PGA Championship golf tournament at the Quail Hollow Club Wednesday, Aug. 9, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Jason Day of Australia, talks during a news conference at the PGA Championship golf tournament at the Quail Hollow Club Wednesday, Aug. 9, 2017, in Charlotte, N.C. (AP Photo/Chris Carlson)
Jason Day signs autographs at the Travelers Championship at TPC River Highlands, Wednesday, June 21, 2017 in Cromwell, Conn. (John Woike/Hartford Courant via AP)
Jason Day, of Australia, and Rory McIlroy, of Ireland, walk up the 18th hole during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/Charlie Riedel)
Jason Day, of Australia, looks down on the ninth hole during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Jason Day, of Australia, reacts on the ninth hole during the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Jason Day, of Australia, and Rory McIlroy, of Ireland, shake hands after the second round of the U.S. Open golf tournament Friday, June 16, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Rory Mcilroy, of Ireland, and Jason Day, of Australia, walk on the eighth hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Charlie Riedel)
Rory Mcilroy, of Ireland, and Jason Day, of Australia, walk on the eighth hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Charlie Riedel)
Jason Day, of Australia, shakes hands with Rory Mcilroy, of Ireland, on the 18th hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/David J. Phillip)
Jason Day, of Australia, hits from a bunker on the ninth hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Chris Carlson)
Jason Day, of Australia, hits from a bunker on the eighth hole during the first round of the U.S. Open golf tournament Thursday, June 15, 2017, at Erin Hills in Erin, Wis. (AP Photo/Charlie Riedel)
Jason Day, of Australia, hits from the 10th fairway during the first round of The Players Championship golf tournament Thursday, May 11, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)
Jason Day of Australia, hits to the 17th green during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)
Jason Day of Australia, reacts after missing a putt on the 17th hole during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/Charlie Riedel)
Jason Day or Australia, gives his club to his caddie Colin Swatton on the 17th hole during the second round of the Masters golf tournament Friday, April 7, 2017, in Augusta, Ga. (AP Photo/David J. Phillip)
Scott Gregory, of England, left, and Jason Day, of Australia, chat on the seventh fairway during a practice round for the Masters golf tournament Tuesday, April 4, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)
Jason Day, of Australia, hits from the fairway on the seventh hole during a practice round for the Masters golf tournament Tuesday, April 4, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)
Jason Day, of Australia, follows his chip shot up to the second green of the Pebble Beach Golf Links during the final round of the AT&T Pebble Beach National Pro-Am golf tournament, Sunday, Feb. 12, 2017, in Pebble Beach, Calif. (AP Photo/Eric Risberg)