Byron Nelson Championship

Associated Press
Padraig Harrington, of Ireland, hits out of a bunker to the first green during the opening round of the PGA Byron Nelson Championship golf tournament, Thursday, May 17, 2012, in Irving, Texas. (AP Photo/Tony Gutierrez)

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Jason Dufner chipped in from 37 feet, his fourth birdie in five holes, for a one-shot lead after two rounds of the Byron Nelson Championship in Irving, Texas.

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