Jason Day

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Jason Day, of Australia, reads the 10th green of the Pebble Beach Golf Links during the third round of the AT&T Pebble Beach National Pro-Am golf tournament Saturday, Feb. 11, 2017, in Pebble Beach, Calif. (AP Photo/Eric Risberg)

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Jason Day, of Australia, hits from the 17th tee of the Monterey Peninsula Country Club Shore Course during the first round of the AT&T Pebble Beach National Pro-Am golf tournament Thursday, Feb. 9, 2017, in Pebble Beach, Calif. (AP Photo/Eric Risberg)

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FILE - In this Sept. 23, 2016, file photo, Jason Day hits from the tee on the second hole during the second round of play at the Tour Championship golf tournament at East Lake Golf Club in Atlanta. The world's No. 1 player hasn't been seen since he withdrew in the second round of the Tour Championship. He starts out a new year on Maui, and can only hope it's a healthy one. (AP Photo/John Bazemore, File)

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Jason Day of Australia, hits from the sixth tee during the final round of The Players Championship golf tournament Sunday, May 15, 2016, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Jason Day, of Australia, waves to spectators on the 16th green during a practice round for the Masters golf tournament, Monday, April 4, 2016, in Augusta, Ga. (AP Photo/Charlie Riedel)

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Jason Day of Australia, pumps his fist after making birdie on the 18th hole during the third round of the BMW Championship golf tournament at Conway Farms Golf Club, Saturday, Sept. 19, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

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Jason Day, of Australia, holds up the winner's trophy after winning The Barclays golf tournament Sunday, Aug. 30, 2015, in Edison, N.J. (AP Photo/Mel Evans)

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Jason Day, of Australia, gets a hug from Jordan Spieth after winning the PGA Championship golf tournament Sunday, Aug. 16, 2015, at Whistling Straits in Haven, Wis. (AP Photo/Chris Carlson)

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Jason Day, of Australia, left, walks off the 18th green with his caddie Colin Swatton after their third round of the U.S. Open golf tournament at Chambers Bay on Saturday, June 20, 2015 in University Place, Wash. (AP Photo/Lenny Ignelzi)

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United States' Keegan Bradley, left, gets a kiss from his girlfriend Jillian Stacey after Bradley and Phil Mickelson won their foursome match 4 and 3 against the International's Jason Day and Graham DeLaet at the Presidents Cup golf tournament at Muirfield Village Golf Club Friday, Oct. 4, 2013, in Dublin, Ohio. (AP Photo/Jay LaPrete)