The 54-hole leader, at 13-under par, is Brandt Jobe, who caught fire late in the third round to vault him into the top spot.
Right on his heels is overnight co-leader Billy Mayfair, who followed up his remarkable second-round 63 with a Saturday 3-under 68.
Two behind Mayfair, and just three off the pace, is a group of four players in a tie for third at 10-under for the tournament. Scott Hoch (67), Charles Howell (68), Corey Pavin (68) and Geoff Ogilvy (66) all will be looking to catch the suprising Jobe on Sunday.
Jobe, who's had two top-10 finishes on the year including a third place at the Western Open, got off to a good start with birdies at No. 2 and 3.
He then went on a par streak that lasted till the 12th where he made a bogey that not only dropped him to 8-under but also got his attention.
A birdie on the par-3 13th started a stretch were Jobe birdie five of the final six holes to take the outright lead going into Sunday.
Jobe, whose Saturday 65 matched his low for the year, made birdie putts of 15, 13, and eight feet on his last three holes as part of his back nine 31.
Mayfair, seeking his first win since 1998, had an eagle and two birdies on the front side but closed with a costly double bogey at the ninth.
Currently 86th on the PGA Tour money list, Mayfair enjoyed a share of the lead for most of the afternoon though unable to make any birdies till the par-4 16th.
He hit his approach shot to within six inches for the tap in birdie and tie for the lead with Jobe at 12-under, only to see Jobe birdie the last to be one clear going into the final round.
David Duval struggled for most of the day and fell from a tie for first to a tie for 15th. Four bogeys and just one birdie left him with a 74 and three day total of minus-6.
Full-field scores from the Michelob Championship at Kingsmill