Round 1 at 2012 HP Byron Nelson Championship

1 of 7 Tony Gutierrez/AP

Phil Mickelson shot an even-par 70 in the first round of the Byron Nelson.

2 of 7 Tony Gutierrez/AP

Mickelson's round featured two birdies and two bogeys.

3 of 7 Darren Carroll/Getty Images

Ryan Palmer shot a six-under 64 to take the lead.

4 of 7 Tony Gutierrez/AP

Padraig Harrington had reached five under before making double bogey at the par-4 12th. He finished at two under.

5 of 7 Tony Gutierrez/AP

Matt Kuchar fired a four-under 66 to get within two shots of leader Ryan Palmer.

6 of 7 Brandon Wade/AP

Defending champ Keegan Bradley shot a 67.

7 of 7 Brandon Wade/AP

Rory Sabbatini struggled to a five-over 75.