Matt Kuchar will take a one-shot lead into the final round of the Crowne Plaza Invitational at Colonial after an unpredictable third day in Texas.
Kuchar had led at the halfway stage of the tournament before Canadian Graham DeLaet took over with the American regaining the lead as form deserted many among the field.
The Ryder Cup player shot a 69 to finish on 11 under overall, one clear of a four-way tie for second comprising DeLaet - who experienced a real rollercoaster of a day - Matt Every, Chris Stroud and Boo Weekley.
Kuchar had enjoyed a one-shot lead over DeLaet at the conclusion of the second round this morning after weather had brought play to a premature halt yesterday.
Kuchar, along with 53 others, had to return this morning and a couple of pars saw him remain in the lead at the halfway stage after replicating his first-round 65.
The American made an ideal start with a birdie at the first but he dropped consecutive shots at the seventh and eighth to find himself knocked off his perch.
It was at this point that DeLaet surged ahead and he was two shots ahead at the halfway stage with a six-strong pack tied for second.
However, the ever-changing nature of the tournament was underlined when DeLaet dropped shots at the 13th, 14th and 17th before there was a reprieve with a birdie at the last.
Kuchar regained the outright lead with birdies at the 11th and 16th.
Every shot a 66 that included five birdies and one bogey to go 10 under overall while a birdie at the last hoisted Stroud alongside his fellow American with a 67.
One shot further back were Martin Flores and Tim Clark who both hit six birdies and one bogey for rounds of 65 to finish on five under for the day.
They were joined in a four-way tie for sixth by John Rollins who shot a 67, Boo Weekley who hit six birdies and two bogeys for a 66 and Steve Flesch.
Flesch had been among the chasing six-pack after two birdies in the first seven holes.
However, bogeys at the ninth, 10th and 13th saw him tumble down the leaderboard before consecutive birdies at the two final holes saw him haul himself back into contention.