Jason Dufner

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Jason Dufner watches his tee shot on the fourth hole during the third round of the PGA Championship golf tournament at Oak Hill Country Club, Saturday, Aug. 10, 2013, in Pittsford, N.Y. (AP Photo/Patrick Semansky)

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Jason Dufner celebrates after a birdie on the 11th hole during the second round of the PGA Championship golf tournament at Oak Hill Country Club, Friday, Aug. 9, 2013, in Pittsford, N.Y. (AP Photo/Charlie Neibergall)

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Jason Dufner watches his tee shot on the second hole during the third round of the PGA Colonial tournament, Saturday, May 26, 2012, in Fort Worth, Texas. (AP Photo/LM Otero)

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Jason Dufner watches his shot off the seventh fairway during the second round of the PGA Colonial golf tournament Friday, May 25, 2012, in Fort Worth, Texas. Dufner finished the second round at 11-under, 129. (AP Photo/Tony Gutierrez)

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Jason Dufner's 25-foot birdie putt on the 18th hole gave him his second PGA Tour win in four weeks. He also won at New Orleans on April 29. (Associated Press)

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Jason Dufner hits out of the sand on the 16th hole during the third round of the PGA Byron Nelson Championship golf tournament Saturday, May 19, 2012, in Irving, Texas. (AP Photo/LM Otero)

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Jason Dufner chips onto the 16th green during the second round of the PGA Byron Nelson Championship on Friday, May 18, 2012, in Irving, Texas. Dufner finished with a two-round score of 7-under-par (AP Photo/Tony Gutierrez)

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Keegan Bradley celebrates on the 18th green after winning a three-hole playoff against Jason Dufner at the PGA Championship golf tournament Sunday, Aug. 14, 2011, at the Atlanta Athletic Club in Johns Creek, Ga. (AP Photo/Matt Slocum)

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Stephen Gallacher of Scotland, left, and Jason Dufner, right in black, make their way to the 10th green around a water hazard during the first round of the U.S. Open at Congressional Country Club in Bethesda, Md., Thursday, June 16, 2011. (Drew Angerer/The Washington Times)