Overnight leader Charley Hoffman fell away with a six-over 77 to finish in a tie for sixth.
CNN: G-Mac back on top after Heritage playoff triumph
He tied for third with 2003 U.S. Open champion Jim Furyk and another American, Charley Hoffman -- who both shot 69.
CNN: SHARE THIS
Driscoll was 18 shots behind leader Charley Hoffman, who will take a two-stroke advantage over 2012 U.S. Open champion Webb Simpson into Sunday's final round.
CNN: Golfer's 'birdies for Boston' bid boosted by freak finish
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