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Matt Kuchar hits off the fourth tee during the second round of the Byron Nelson Championship golf tournament Friday, May 18, 2012, in Irving, Texas. Kuchar shot a two-day total 6-under, 234 going into the weekend. Tony Gutierrez, Associated Press
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Jason Dufner chips onto the 18th green during the second round of the PGA Byron Nelson Championship golf tournament on Friday, May 18, 2012, in Irving, Texas. Tony Gutierrez, Associated Press
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Jason Dufner chips onto the 16th green during the second round of the PGA Byron Nelson Championship golf tournament Friday, May 18, 2012, in Irving, Texas. Dufner finished with a two-round score of 7-under-par Tony Gutierrez, Associated Press
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Keegan Bradley acknowledges applause from the gallery after putting for par on the fourth green during the second round of the Byron Nelson Championship golf tournament Friday, May 18, 2012, in Irving, Texas. Bradley, the defending tournament champion, ha Tony Gutierrez, Associated Press
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Matt Kuchar reacts to leaving a putt short for birdie on the number three green during the second round of the Byron Nelson Championship golf tournament Friday, May 18, 2012, in Irving, Texas. Tony Gutierrez, Associated Press
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Keegan Bradley hits off the fourth tee box during the second round of the Byron Nelson Championship golf tournament Friday, May 18, 2012, in Irving, Texas. Bradley, the defending tournament champion, has a 5-under, 135 two-day total going into the weeken Tony Gutierrez, Associated Press
By Associated Press

IRVING, Texas — Jason Dufner birdied four of the last five holes Friday for a 4-under 66 and a one-stroke lead after the second round of the Byron Nelson Championship.

Dufner capped the round with a 37-foot chip-in at the 429-yard 18th, where he drove wide right and hit an approach that rolled over the green into a swale behind the hole.

The winner last month in New Orleans for his first PGA Tour title, Dufner also holed a 35-foot chip at No. 15. He had a 7-under 133 total.

Matt Kuchar, coming off a victory Sunday in The Players Championship, was second along with first-round leader Ryan Palmer, Chad Campbell, Pat Perez, Dicky Pride and Marc Leishman. Kuchar shot a 68.

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Phil Mickelson finished with a double bogey for a 69. He was 1 under.

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