Phil Mickelson, right, smiles at his caddie Jim Mackay as he birdies on the fourth hole during the first round of the Houston Open golf tournament on Thursday, April 3, 2014, in Humble Texas. (AP Photo/Patric Schneider)
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Phil Mickelson, right, smiles at his caddie Jim Mackay as he birdies on the fourth hole during the first round of the Houston Open golf tournament on Thursday, April 3, 2014, in Humble Texas. (AP Photo/Patric Schneider)
