The 51-year-old, who did not turn pro until he was 32, fired a two-under 68 on the final day of the third major of the year for over-50s for a 14-under 266 total.
He was two clear of Tom Lehman (69) and three ahead of Olin Browne (65).
Daley, who is perhaps best known for a five-foot putt in the 2000 PGA Tour qualifying school that rolled slowly into the centre of the cup only to bounce back out and leave him one shot shy of a tour card, created a new legacy with his solid finish.
"Wow, this feels like jumping out of an airplane man, except I'm not going 120 miles an hour," Daley said.
Daley carved out back-to-back birdies either side of the turn and while nerves helped him to a penultimate hole bogey he recovered for a nice long curling birdie on the last.
Overnight leader Mark Calcavecchia struggled to a two-over 72 to finish tied fourth with 2011 champion Fred Couples (71) four off the pace.