Bettencourt ran off four consecutive birdies today on the super slick greens of Muirfield Village, survived a few scary moments on the back nine and wound up with a 4-under 68 to share the 54-hole lead with two-time tour winner Mark Wilson.
They were at 9-under 207, with a host of major champions lurking, including Tiger Woods.
Jim Furyk steadied himself for a 1-under 71 and was one shot behind with Jonathan Byrd, who overcame a triple bogey on the par-3 fourth and finished with a birdie for a 71.
Former U.S. Open champion Geoff Ogilvy, who started the third round nine shots out of the lead, turned in a tournament-best 63 and was atop the leaderboard for most of the warm afternoon. Ogilvy wound up at 209, tied with former PGA champion Davis Love III, who chipped in for birdie on his last hole.
Woods turned away a half-dozen times on birdie putts that burned the edge, but he climbed into contention on the back nine and shot a 68, leaving him four shots behind.