"I drove it fantastic. Hit a lot of quality iron shots, and putted actually okay." Tiger Woods was close enough after a 67 had him four off the lead but Australia's hopes all but vanished after Adam Scott and John Senden failed to charge.
Scott put himself into position to make a back-nine move but stalled coming home and seemingly played himself out of the tournament.
Senden also had a day to forget, shooting 73 to fall to three-over and a tie for 22nd.
In a week where he's been statistically better than usual with his putter, Senden was left to rue a few costly three-putts.
He carded three bogeys and a double bogey with just two birdies.
Leaderboard
202: Brandt Snedeker (USA) 68 70 64, Justin Rose (ENG) 66 68 68
204: Ryan Moore (USA) 69 70 65
205: Rory McIlroy (NIR) 69 68 68, Bubba Watson (USA) 69 66 70, Jim Furyk (USA) 69 64 72
206: Tiger Woods (USA) 66 73 67, Robert Garrigus (USA) 68 69 69, Matt Kuchar (USA) 67 69 70, Bo Van Pelt (USA) 67 68 71.
- AAP