Three-way tie in Texas as Americans take control
A round of 64 saw England's Brian Davis on his own just one shot further back as he looked to bounce back having failed to secure an Open Championship place at a qualifier earlier this week.
Of the leading trio, only Overton enjoyed a bogey-free opening round, while Adams and Bohn suffered one apiece at the Colonial Country Club in Texas.
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Hide AdDavis bogeyed the ninth and picked up seven birdies in an impressive six-under round, while fellow Englishmen Paul Casey
was in a share of 14th after a four-under 66. Justin Rose was among a large group tied for 19th following a 67.
Meanwhile, 2008 winner Phil Mickelson endured a difficult day with a one-over 71 to leave him in a share of 89th. Defending champion Steve Stricker fared better with a 68.