"I wish I could have put a little heat on him," Furyk said, "make him work those last two holes a little bit harder."
Furyk bogeyed the final two holes for a 1-over 71. Dufner did the same, leaving him with a 68 for the final round and at 10-under 270 overall.
He finished it off with a tap-in from a few inches away.
About as exciting as Dufner himself.
"I had a bit of a cushion there," he said, before taking a poke at his struggles on the greens. "That last putt was in the perfect range for me to make. There's not much to celebrate from six inches or less, but it's nice to have that short of a putt to cap this off."
Henrik Stenson (70) finished three shots back, missing a chance to become the first Swedish man to capture a major championship. Another Swede, Jonas Blixt, was four behind the winner.
Tiger Woods and Phil Mickelson were long gone by the time the leaders teed off.
Woods' winless streak in the majors is now more than five years long, and this one was especially perplexing. Just a week earlier, he wrapped up a dominating seven-stroke victory at the Bridgestone. He never got anything going at Oak Hill, putting up four straight rounds in the 70s and finishing a whopping 14 shots behind Dufner.
"Just the way it goes," Woods said.
Mickelson was only three weeks removed from one of the greatest closing rounds in major championship history at Muirfield, rallying to claim his first British Open title.
Lefty apparently left his swing on the other side of the Atlantic. After four days of spraying shots all over the place, he finished 22 shots behind in a tie for 72nd place. Only two players fared worse on the weekend.