Justin Rose fired a third-round 63 to join Jim Furyk at the top of the WGC-Birdgestone Invitational leaderboard.
The Englishman climbed seven places on Saturday to sit on nine-under, level with Furyk and two shots clear of Shane Lowry in third. Bubba Watson, Henrik Stenson, Steven Bowditch and Ian Poulter are next best on five-under.
After going 30 holes without a birdie, Rose, who started six shots off the pace, found form on Saturday, sinking seven birdies in a bogey-free round of 63.
Rose began the day strongly with back-to-back birdies at the first and second before adding a further birdie at the eighth to take the turn in 32. After a quiet start to the back nine, Rose birdied four of the last six holes, including a 40-foot birdie putt at the last, to move into a share of the lead.
Furyk, who has recorded nine top-10 finishes at the event, began the day four shots clear, and after taking the turn in 34 courtesy of two birdies and a bogey, the American briefly held that cushion once more thanks to a birdie at the 11th.
However, a bogey at the 12th followed, and with Rose on a hot streak on the back nine, Furyk was reeled in after closing with six straight pars in a round of 69.
Lowry, who is chasing his first win on the PGA Tour, moved to seven-under after carding a 67 that included five birdies and two bogeys.
Bowditch and Poulter were two of the big movers on the day, with rounds of 63 and 65 respectively seeing them rocket up the leaderboard. They are joined on five-under by world number three Watson (69), and Stenson (68).
A further shot back are Robert Streb (68), Brooks Koepka (68), and Greame McDowell (69). World number two Jordan Spieth sits nine shots off the pace after a round of two-over 72 saw him drop back to level par and a share of 17th.