Tom Lehman shot a five-under-par 67 on Saturday to join Briny Baird at the top of the leaderboard after the third round of the Funai Classic.
Lehman and Baird, who carded a 68, are on 17-under 199, one shot ahead of Scott Verplank and two in front of Cameron Beckman in fourth place.
South Africa's Tim Clark had the round of the day, an eight-under 64, to move from a tie for 34th to joint fifth on 202 with world number one Vijay Singh, Mark Calcavecchia and Australia's Geoff Ogilvy.
Former British Open champion Ben Curtis is in a group of four players on 203 alongside Joey Sindelar, Australia's Mark Hensby and Stephen Ames of Trinidad and Tobago.
A total of 20 players are within five strokes of Lehman and Baird.
Singh, the winner of eight titles on the US PGA Tour this season, has won his last three tour starts and five of his last six. He opened the Funai with a six-under 66 but drifted back into the pack on Friday when he slipped to a 71.
On Saturday, Singh birdied five of his first seven holes, then added three more over the first four holes of the back nine of the Magnolia Golf Course at the Walt Disney resort.
His eight birdies were just one short of his total for the first two rounds.
"I wasn't doing anything wrong, I just wasn't taking enough time on the backswing," Singh said of his scoring problems in the second round.
LEADING 3RD ROUND SCORES: (US unless stated) 199 Briny Baird 65 66 68, Tom Lehman 66 66 67, 200 Scott Verplank 70 65 65, 201 Cameron Beckman 68 65 68, 202 Tim Clark (South Africa) 69 69 64, Mark Calcavecchia 71, 66 65, Vijay Singh (Fiji) 66 71 65, Geoff Ogilvy (Australia) 68, 67 67, 203 Ben Curtis 66 71 66, Joey Sindelar 66 70 67, Stephen, Ames (Trinidad and Tobago) 65 71 67, Mark Hensby (Australia) 64 71 68, 204 Dan Forsman 68 70 66, Loren Roberts 71 67 66, Scott, McCarron 69 67 68, Bart Bryant 66 71 67, Ryan Palmer 68 68 68,, Lucas Glover 68 68 68, John Huston 64 71 69, Harrison Frazar 67 67 70, Chris DiMarco 69 65 70, Hank Kuehne 69 64 71
OTHER INTERNATIONAL PLAYERS: 206 Daniel Chopra (Sweden) 67 71 68, Jose Maria Olazabal (Spain) 65 72 69, Richard S. Johnson (Sweden) 68 67 71, 207 Fredrik Jacobson (Sweden) 69 70 68, Stephen Leaney, (Australia) 70 69 68, David Frost (South Africa) 71 68 68, 208 Carl Pettersson (Sweden) 70 70 68, Justin Rose (Britain), 71 68 69, Craig Perks (New Zealand) 73 65 70, Stuart Appleby, (Australia) 69 66 73, Brenden Pappas (South Africa) 67 67 74, 209 Deane Pappas (South Africa) 70 70 69, Carlos Franco, (Paraquay) 69 71 69, Rod Pampling (Australia) 69 69 71, 210 Jose Coceres (Argentina) 70 70 70, Steve Allan, (Australia) 67 72 71, 211 Esteban Toledo (Mexico) 73 67 71, 212 Arjun Atwal (India) 68 71 73.