-18 J Bohn (US) -16 J Overton (US) -14 T Merritt (US) -13 L Janzen (US) -12 G Chalmers (Aus) -11 S Appleby (Aus)
Selected others: -8 G Owen (Eng) -7 A Cejka (Ger) -5 KJ Choi (Kor) -4 J Rose (Eng) -2 B Davis (Eng)
Bohn turned pro in 1992 after winning $1m in a hole-in-one event
Jason Bohn birdied three of the last four holes to win his second PGA Tour title by two shots at the weather-delayed Zurich Classic of New Orleans.
The American was two strokes clear when the rain-interrupted third round was completed earlier on Sunday.
He closed with a flawless five-under-par 67 for an 18-under total of 270.
A day after celebrating his 37th birthday, Bohn birdied 15, 16 and the par-five last, where he nearly holed out with a wedge approach.
Fellow American and playing partner Jeff Overton fired a bogey-free 66 to finish second at 16-under, two strokes in front of compatriot Troy Merritt (67).
"I'm probably the only guy on the PGA Tour who has got tears when he's putting out on the 18th hole," said a jubilant Bohn after becoming the first since Calvin Peete in 1986 to lead after every round in the tournament.
"When I hit the shot on 15 and made the great putt on 16, I knew if I stayed patient I had it," added Bohn, who was forced to complete the last 12 holes of his third-round 71 on Sunday morning so the event could finish on schedule.
England's Greg Owen, who had began the tournament so promisingly with a 67, carded a level-par 72 to finish eight shots off the pace.
Owen's compatriot Justin Rose was a further four shots back after he sank three birdies for a final-round 70.