The American carded seven birdies, an eagle at the par-four 15th hole and a bogey as he raced up the leaderboard to sit on 12 under for the tournament.
He finished with a real flourish, going birdie-eagle-birdie-par-birdie from the 14th, to sit in second place, three shots off Webb Simpson, the overnight leader having yet to start his third round.
Jimmy Walker also enjoyed an impressive third round, the American carding a 64 to move on to 10 under.
He was joined by Stuart Appleby thanks to the Australian's 65.
Scotland's Russell Knox had started the day on 10 under, but a birdie on the very first hole lifted him into a group of six on 11 under.
JJ Henry was the only other member of that party to have teed off and he was level par after one hole.