Rory Mcilroy

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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)

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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)

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Rory Mcilroy, of Ireland, makes his way to the 12th 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)

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Rory Mcilroy, of Ireland, reacts after putting 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)

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Rory Mcilroy, of Ireland, hits on the range during a practice day for the U.S. Open golf tournament Wednesday, June 14, 2017, at Erin Hills in Erin, Wis. (AP Photo/Morry Gash)

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Rory Mcilroy, of Ireland, hits on the range during a practice day for the U.S. Open golf tournament Wednesday, June 14, 2017, at Erin Hills in Erin, Wis. (AP Photo/Morry Gash)

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FILE - In this Friday, April 7, 2017 file photo, Rory McIlroy of Northern Ireland, hits to the 18th green during the second round of the Masters golf tournament in Augusta, Ga. McIlroy won the first of his four majors in the U.S. Open six years ago at Congressional, a course so softened by rain that he shattered the scoring record (268) and won by eight shots. (AP Photo/David J. Phillip, File)

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Rory McIlroy of Northern Ireland, reacts to his putt on the second green, during the final round of The Players Championship golf tournament Sunday, May 14, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Rory McIlroy, of Northern Ireland, gestures after missing a birdie putt on the seventh green during the second round of The Players Championship golf tournament Friday, May 12, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Rory McIlroy, of Northern Ireland, reacts to his shot from the ninth tee during the first round of The Players Championship golf tournament Thursday, May 11, 2017 in Ponte Vedra Beach, Fla. (AP Photo/Lynne Sladky)

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Rory McIlroy, of Northern Ireland, walks away after he missed a shot on the 11th green during the first round of The Players Championship golf tournament Thursday, May 11, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Rory McIlroy, of Northern Ireland, hits from a sand trap on the 11th hole, during a practice round for The Players Championship golf tournament Wednesday, May 10, 2017, in Ponte Vedra Beach, Fla. (AP Photo/Chris O'Meara)

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Rory McIlroy of Northern Ireland, looks back on the seventh green during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)

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Rory McIlroy of Northern Ireland, waves after his birdie on the second hole during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/David J. Phillip)

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Rory McIlroy of Northern Ireland, hits to the seventh hole during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)

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Rory McIlroy of Northern Ireland, watches his chip shot on the eighth hole during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/Chris Carlson)

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Rory McIlroy of Northern Ireland, drops his putter on the 13th hole during the third round of the Masters golf tournament Saturday, April 8, 2017, in Augusta, Ga. (AP Photo/Matt Slocum)

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Rory McIlroy of Northern Ireland, walks off the 18th hole during the second round of the Masters golf tournament Friday, April 7, 2017, in Augusta, Ga. (AP Photo/David J. Phillip)

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Rory McIlroy of Northern Ireland, hits to the 18th green during the second round of the Masters golf tournament Friday, April 7, 2017, in Augusta, Ga. (AP Photo/David J. Phillip)

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Rory McIlroy of Northern Ireland, bounces a ball on his putter after playing the second hole during the second round of the Masters golf tournament Friday, April 7, 2017, in Augusta, Ga. (AP Photo/David Goldman)