Jason Christopher Dufner is an American professional golfer who currently plays on the PGA Tour where he is a five-time winner. He has won one major championship, the 2013 PGA Championship. He was also runner-up in the 2011 PGA Championship, losing a playoff to Keegan Bradley. Dufner was ranked in the top 10 in the Official World Golf Ranking for 50 weeks; his career-high ranking is sixth in September 2012.

In January 2016, Dufner won his fourth PGA Tour title at the CareerBuilder Challenge at PGA West. This ended a two-and-a-half year winless drought since his 2013 PGA Championship victory. He defeated David Lingmerth in a sudden-death playoff after both players finished four shots clear of the field at 25-under-par. Lingmerth had a chance to win on the first playoff hole, but could not hole his birdie putt from 20 feet and Dufner had to hole a 10-foot putt for par, meaning the players returned to the 18th for the second extra hole. After finding the light rough with his tee shot, Lingmerth hooked his second shot into the water on the left, allowing Dufner to comfortably finish the hole and take the title.

On June 4, 2017, Dufner won the Memorial Tournament.

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