Round 2 at 2012 Byron Nelson Championship

1 of 6 Fred Vuich/SI
Jason Dufner birdied four of the last five holes to grab a one-shot lead heading into the weekend.
2 of 6 Darren Carroll/Getty Images
Phil Mickelson had a good round going until a double bogey on 18.
3 of 6 Tony Gutierrez/AP
Matt Kuchar, who won last week at the Players, is among a large group one shot back.
4 of 6 Tony Gutierrez/AP
Defending champion Keegan Bradley made six birdies and four bogeys.
5 of 6 Tony Gutierrez/AP
Jason Day is three shots back after a 68.
6 of 6 Darren Carroll/Getty Images
Ricky Barnes was in contention until a triple bogey on No. 14.