Rory Mcilroy

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Rory McIlroy, of Northern Ireland, catches a ball on the range before a practice round for the PGA Championship golf tournament Wednesday, Aug. 12, 2015, at Whistling Straits in Haven, Wis. (AP Photo/Chris Carlson)

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In this image released Monday July 6, 2015 by world number one golfer Rory Mcilroy shows him as he poses on crutches and with his left leg in a medical support. McIlroy ruptured a ligament in his left ankle while playing soccer less than two weeks before the start of his British Open title defense. The Northern Irish golfer gave no indication how long he would be out in the announcement Monday July 6, 2015 on his Instagram account, only saying that he is "working hard to get back as soon as I can." (Rory McIlroy via AP) MANDATORY CREDIT

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Rory McIlroy, of Northern Ireland, walks off the second green during the final round of the U.S. Open golf tournament at Chambers Bay on Sunday, June 21, 2015 in University Place, Wash. (AP Photo/Ted S. Warren)

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Rory McIlroy, of Northern Ireland, watches his tee shot on the fourth hole during the first round of the U.S. Open golf tournament at Chambers Bay on Thursday, June 18, 2015 in University Place, Wash. (AP Photo/Matt York)

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Rory McIlroy, of Northern Ireland, warms up on the range before a practice round for the U.S. Open golf tournament at Chambers Bay on Tuesday, June 16, 2015 in University Place, Wash. (AP Photo/Lenny Ignelzi)

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Rory McIlroy, of Northern Ireland, hands Niall Horan from the band One Direction a club during the Par 3 contest at the Masters golf tournament Wednesday, April 8, 2015, in Augusta, Ga. (AP Photo/Matt Slocum)

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Rory McIlroy, of Northern Ireland, tees off on the second hole during a practice round for the Masters golf tournament Wednesday, April 8, 2015, in Augusta, Ga. (AP Photo/Matt Slocum)

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Europe’s Rory McIlroy celebrates his birdie on the 12th hole during the singles match on the final day of the Ryder Cup golf tournament, at Gleneagles, Scotland, Sunday, Sept. 28, 2014. (AP Photo/Peter Morrison)

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Europe’s Rory McIlroy celebrates winning his match against Rickie Fowler of the US on the 14th hole during the singles match on the final day of the Ryder Cup golf tournament, at Gleneagles, Scotland, Sunday, Sept. 28, 2014. (AP Photo/Peter Morrison)

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Europe’s Rory McIlroy signs autographs for fans as he walks to the 16th tee during a practice round ahead of the Ryder Cup golf tournament at Gleneagles, Scotland, Tuesday, Sept. 23, 2014. (AP Photo/Matt Dunham)

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Europe's Graeme McDowell, left, is congratulated by Rory McIlroy after making a putt to half the 13th hole during a foursomes match at the Ryder Cup PGA golf tournament Friday, Sept. 28, 2012, at the Medinah Country Club in Medinah, Ill. (AP Photo/David J. Phillip)

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Rory McIlroy, of Northern Ireland, follows his shot off the second tee in the third round of the BMW Championship golf tournament in Cherry Hills Village, Colo., Saturday, Sept. 6, 2014. (AP Photo/David Zalubowski)

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**FILE** Rory McIlroy of Northern Ireland hugs his father Gerry McIlroy after the final round of the PGA Championship golf tournament on the Ocean Course of the Kiawah Island Golf Resort in Kiawah Island, S.C., Sunday, Aug. 12, 2012. (AP Photo/Chuck Burton)