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Phil Mickelson shot an even-par 70 in the first round of the Byron Nelson.
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Mickelson's round featured two birdies and two bogeys.
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Darren Carroll/Getty Images
Ryan Palmer shot a six-under 64 to take the lead.
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Padraig Harrington had reached five under before making double bogey at the par-4 12th. He finished at two under.
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Matt Kuchar fired a four-under 66 to get within two shots of leader Ryan Palmer.
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Defending champ Keegan Bradley shot a 67.
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Rory Sabbatini struggled to a five-over 75.