Rory Mcilroy

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Rory McIlroy, of Northern Ireland, reacts to his shot from the 13th fairway during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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Rory McIlroy, of Northern Ireland, hits out of a bunker on the 18th hole during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)

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Rory McIlroy, of Northern Ireland, hits from a bunker on the 14th hole during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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Rory McIlroy, of Northern Ireland, reacts following a birdie on the 13th hole during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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Rory McIlroy, of Northern Ireland, reacts to his shot from the 14th fairway during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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Rory McIlroy, of Northern Ireland, hits from the 14th fairway during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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Rory McIlroy, of Northern Ireland, hits from a bunker on the 14th hole during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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Rory McIlroy, of Northern Ireland, tees off on the 15th hole during the first round of the Memorial golf tournament Thursday, May 29, 2014, in Dublin, Ohio. (AP Photo/Darron Cummings)

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CORRECTS SPELLING TO MCILROY, INSTEAD OF MCILLROY - Rory McIlroy, of Northern Ireland, signs autographs for fans during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)

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CORRECTS SPELLING TO MCILROY, INSTEAD OF MCILLROY - Rory McIlroy, of Northern Ireland, tees off on the fifth hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)

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CORRECTS SPELLING TO MCILROY, INSTEAD OF MCILLROY - Rory McIlroy, of Northern Ireland, watches his putt on the fourth hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)