Round 1 at 2012 Shell Houston Open

1 of 8 Scott Halleran/Getty Image
A thunder storm moved into the area Thursday afternoon, causing a lengthy rain delay in the middle of the first round at the Houston Open.
2 of 8 Matt Sullivan/Getty Images
Phil Mickelson is the defending champion this week.
3 of 8 Matt Sullivan/Getty Images
Mickelson dropped a birdie putt at the first to get to one under before the delay began.
4 of 8 Matt Sullivan/Getty Images
Keegan Bradley was even at the turn, but made five birdies over his last nine holes to get to five under.
5 of 8 Scott Halleran/Getty Images
Carl Pettersson fired a seven-under 65 in the morning to tie Angel Cabrera for the early lead.
6 of 8 Matt Sullivan/Getty Images
Graeme McDowell made three birdies and a bogey on his second nine to salvage a 70.
7 of 8 Scott Halleran/Getty Images
Paul Casey was one under through 17 when play was suspended.
8 of 8 Matt Sullivan/Getty Images
Rookie Bud Cauley shot a 67 on day one.