Dublin

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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)

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Kevin Na, of South Korea, putts during the practice round for the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)

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Rain begins to fall as Matt Kuchar plays his last 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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Matt Kuchar signs autographs after finishing the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)

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Matt Kuchar tosses an autographed ball to a fan after finishing the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)

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Charl Schwartzel, of South Africa, hits his approach shot on the ninth hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)