Mark Wiebe carded a 3-under 69 on Saturday to maintain his lead following two rounds at the Hawaii Championship.
The Senior British Open winner finished 36 holes at blustery Kapolei Golf Course at 11-under-par 133.
Three-time major champion Vijay Singh, who is making his Champions Tour debut, fired the low round of the day with a 6-under 66 to jump into sole possession of second place at 9-under 135.
"The wind is really tricky out here, you know. You can get lucky with the wind or not," said Singh. "You may get a big gust when you hit a good putt on the wind, so I'm looking good, I feel good. I don't know if I'm going to be nervous or excited tomorrow, but we'll have to wait and see."
Corey Pavin (68) and Brian Henninger (69) share third at 8-under, while Sandy Lyle (67) and John Cook (71) are tied for fifth at 7-under.
Two-time winners this season Bernhard Langer and David Frost shot matching 69s to move into a group of players occupying seventh place at minus-6.
They are joined by Dick's Sporting Goods Open champion Bart Bryant (70), Gene Sauers (69) and Mark Calcavecchia (72).
Wiebe entered the second round holding a 2-stroke lead, but his advantage quickly disappeared as Calcavecchia birdied the first and third to meet Wiebe at 8-under as the overnight leader parred his first three holes.
Wiebe snapped the streak with back-to-back birdies at the fourth and fifth to regain sole possession of first.
Calcavecchia, who was playing in the same group as Wiebe, tripped to a bogey at the fifth to hand Wiebe a 3-stroke lead, and would continue to drop shots at the sixth and seventh to fall well off the pace.
Wiebe's advantage stretched to four strokes when he rolled in another gain at the ninth, moving him to 11-under at the turn.
Singh, meanwhile, had birdied four of his first six holes to sit at 7-under and own sole possession of second place before collecting a birdie at the 14th to move within three shots of Wiebe.
After Wiebe countered a birdie at the 12th with a bogey at the 13th to remain at 11-under, Singh birdied the 17th to move within two strokes of the lead. Singh parred his final hole to remain there.
Wiebe briefly extended his advantage back up to three shots with a birdie at the 14th, but followed that with a bogey at the 16th to again fall back to minus-11 and closed his round with a couple of pars to hang on to his 2-stroke advantage heading into the final round.
"I thought the wind blew harder today," said Wiebe. "Another day where you have to choose your moments. It was a grind for all of us, really a test today."
NOTES: Wiebe is a four-time Champions Tour winner .. Wiebe is holding the second-round lead for the fifth time on the Champions Tour. He has gone on to win two of the four previous times he has held the second-round lead ... Singh won the Masters in 2000 and the PGA Championship in both 1998 and 2004 ... Russ Cochran was disqualified for not signing his scorecard.