Dufner, who failed on several occasions to Monday qualify earlier this season, has made the most of his last two events. He got into the field last week and tied for 12th, which earned him a spot in this week's event.
The victory Sunday gave Dufner full exempt status on the Buy.Com Tour for the rest of this year and next. He earned a first prize of $76,500, which vaulted him into the top-25 on the money list.
'It probably hasn't really set in right now, but I am pretty excited to be out on the Buy.Com Tour for the rest of this year and the next couple years,' said the 24-year-old Auburn graduate. 'It's just a good stepping stone for me. I kind of got tired of playing the mini-tours.'
Dufner's 8-under 64 on Saturday gave him a two-shot lead heading into the final round. He didn't make any mistakes on Sunday, posting birdies at the par-5 sixth hole and the par-4 11th before closing with an eagle on the par-5 18th.
'I was just trying to make no bogeys today,' said Dufner. 'I wanted those guys to catch me and not give up shots. It just worked out that way for me.'
'Those guys' included Todd Rose and David Gossett, who each matched Dufner's 68 to tie for second at 19-under-par. Second-round leader Jeff Gove, who struggled to a 1-over 73 on Saturday, also tied for second place after firing a 6-under 66 on Sunday.
Full-field scores from the Buy.Com Wichita Open