Phil Mickelson putts on the first hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Matt Kuchar watches his tee shot on the eighth hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Adam Scott, of Australia, lines up his putt on the eighth hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Matt Kuchar putts on the seventh hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Rory McIllroy, 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)
Ernie Els, of South Africa, tees off on the third hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Justin Rose, of England, hits his tee shot on the first hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Phil Mickelson tees off on the second hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Adam Scott, of Australia, tees off 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)
Adam Scott, of Australia, putts on the eighth hole during the pro-am for the the Memorial golf tournament Wednesday, May 28, 2014, in Dublin, Ohio. (AP Photo/Jay LaPrete)
Rory McIllroy, 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)