Shell Houston Open in pictures

<div class="meta image-caption"><div class="origin-logo origin-image "><span></span></div><span class="caption-text">Phil Mickelson watches his tee shot during the first round of the Houston Open golf tournament, Thursday, March 28, 2013 in Humble, Texas.   (AP Photo&#47; Bob Levey)</span></div>
March 29, 2013 10:18:48 AM PDT