The 2012 HP Byron Nelson Championship teed off on a gorgeous Thursday morning in Irving, Texas.

Australian Marc Leishman has taken the early lead Day One, and his score of 65 (-5) has been good enough to maintain the lead throughout most of the day.

There are currently seven golfers at -2 still on the course, and none have even completed the front nine, so Leishman's lead may not hold up.

Phil Mickelson had an up and down day. With two birdies and two bogies, Mickelson finished the day even.

Here are the Top Ten as of this moment:

Pos Golfer Total Rd 1 Thru

1. Marc Leishman (AUS) -5 65 18

T2. Scott Piercy (USA) -4 66 18

T2. Bill Lunde (USA) -4 66 18

T2. Charley Hoffman (USA) -4 66 18

T5. Greg Owen (ENG) -3 67 18

T5. Josh Teater (USA) -3 67 18

T5. James Driscoll (USA) -3 67 18

T5. Ricky Barnes (USA) -3 67 18

T5. Jason Dufner (USA) -3 67 18

T5. Jhonattan Vegas (VEN) -3 67 18

Others:

T29. Padraig Harrington (IRE) -1 - 6

752. Phil Mickelson (USA) 0 70 18