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.

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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

The American closed with two birdies to sign for a 68 and take a handy lead over compatriots Daniel Summerhays (69) and Charley Hoffman (67) as well as Australia's Steven Bowditch (69).

CNN: Cactus prick sparks McIlroy revival in Texas

Ahead of McIlroy and four shots back on the leaders in a tie for third are Jeev Milkha Singh of India and Colombia's Camilo Villegas, with Denmark's Soren Kjeldsen and Spain's Alvaro Quiros joining Americans Jim Furyk, Charley Hoffman and Kenny Perry on 11 under.

BBC: Mickelson and Watney take control

Rookie Brendan Steele paid for a double-bogey at 15 and a missed short birdie putt at 18 on Friday as his par 72 left him level with former U.S. Open champion Geoff Ogilvy (72), Rich Beem (70), Kevin Sutherland (70), Charley Hoffman (73), Brandt Snedeker (72), and Kevin Chappell (73).

CNN: Leader McIlroy feeling the heat in Malaysia