Byron Nelson Golf

Jason Dufner prepares to putt on the first green during the first round of the Byron Nelson Championship golf tournament Thursday, May 16, 2013, in Irving, Texas. Dufner, who shot even-par on the first day, is the tournament's defending champion. (AP Photo/Tony Gutierrez)
Jason Dufner prepares to putt on the first green during the first round of the Byron Nelson Championship golf tournament Thursday, May 16, 2013, in Irving, Texas. Dufner, who shot even-par on the first day, is the tournament's defending champion. (AP Photo/Tony Gutierrez)

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