Howell, a 28-year-old two-time winner on the PGA Tour, completed 54 holes at 13-under-par 203. He has held three previous 54-hole leads, but has lost all three events.

Kenny Perry, who began the round three shots behind second-round leader Jonathan Byrd, had his second straight 3-under 69 to move into second at 12-under 204.

Byrd had a 73 Saturday to drop into a tie for third at 11-under 205 where he was joined by David Toms (69) and Ryan Palmer (70).

Ryuji Imada, a playoff loser in last year's Classic, vaulted into contention with a 66 Saturday. He shares sixth place at 206 with Heath Slocum (69), one shot ahead of Justin Bolli (68).