Matt Kuchar of the US put the finishing touches on his impressive rain-hit second round on Saturday and then maintained a one-shot lead after the third round of the Crowne Plaza Invitational at Colonial in Fort Worth, Texas.
Kuchar, who clinched his fifth PGA Tour title at the WGC-Accenture Match Play Championship in February, made three pars in the early hours at Colonial Country Club to complete a five-under 65 second round, before a third-round 69 left him with an 11-under total of 199.
Fellow Americans Matt Every (66), Chris Stroud (67) and Boo Weekley (66), and Canadian Graham DeLaet (69) were a further shot back at 10-under.
The final round promised to be wide open as 22 players were within five shots of Kuchar.
World No. 13 Kuchar opened his third round with a birdie on the first, but stumbled with bogeys at the par-four seventh and the par-three eighth.
However, the five-time winner steadied the ship and birdied the par-five 11th and par-three 16th to grab the outright lead.
DeLaet looked like he would grab the third-round lead after three birdies in his opening 11 holes, but thoughts of his maiden PGA Tour victory were tempered with three bogeys at the 13th, 14th and 17th holes.
A closing birdie allowed the three-time Canadian Tour winner to keep his dream alive.
Every made his run with three birdies in his opening six holes and another at the 13th. He bogeyed the 14th, but gained the stroke back with a birdie at 18.
Two-time tour winner Weekley had four birdies in his opening 12 holes, added further birdies at 15 and 18, but dropped a shot on the 14th and 16th holes.
After a bogey on the fifth, Stroud claimed four birdies in the final 13 holes to move into contention.