Keegan Bradley moved 79 places in the hole playoff to win the PGA Championship at Atlanta Athletic Club.
Bradley, winner of two events as a rookie this season on the PGA Tour, vaulted to No. 29 in the world, ahead of such golfers as Tiger Woods (33), Ernie Els (32) and British Open champ Darren Clarke (35).
Dufner, who squandered a significant lead down the stretch, moved from 80th to 38th with the runner-up finish.
Steve Stricker, however, moved ahead two spots to No. 3 after contending in Johns Creek this week, but ultimately finishing in a tie for 12th. Martin Kaymer and Rory McIlroy both dropped a spot to fourth and fifth, respectively.
Phil Mickelson was again in sixth, while Adam Scott moved from eighth to seventh after a seventh place finish at the PGA Championship. Jason Day and Dustin Johnson both fell one to eighth and ninth, respectively, to accommodate Scott, and Nick Watney remained at No. 10.
Charl Schwartzel and Matt Kuchar switched spots in the rankings, with the Masters champ Schwartzel taking over 11th and Kuchar falling to 12th. The next three players stayed in the same spot: No. 13 Graeme McDowell, No. 14 K.J. Choi and No. 15 Bubba Watson.
A pair of Englishmen in Ian Poulter and Paul Casey traded places, as Poulter moved ahead one place to No. 16 and Casey fell back to No. 17. No. 18 Davis Toms and No. 19 Robert Karlsson both moved ahead one spot, while Kyung-tae Kim dropped two spots to No. 20.
Woods continued his freefall after missing the cut at the PGA Championship for the first time, dropping three spots from No. 30 to No. 33.