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Philadelphia, PA (Sports Network) - Jason Dufner's first PGA Tour victory, a playoff win over Ernie Els at the Zurich Classic of New Orleans, moved Dufner to 20th in this week's world rankings.

Dufner rose 10 places to crack the top 20 for the first time.

Luke Donald finished third in New Orleans and is back to No. 1 after Rory McIlroy held the spot for two weeks. The reigning U.S. Open champion is down to second, followed by Lee Westwood, Masters winner Bubba Watson and Hunter Mahan.

Steve Stricker and Tiger Woods both inched up to Nos. 6 and 7, respectively. Former world No. 1 Martin Kaymer fell two to eighth. Justin Rose and Phil Mickelson switched places this week with Rose in ninth and Mickelson down to 10th.

Louis Oosthuizen held on to 11th and Charl Schwartzel climbed one to 12th. Adam Scott slipped one to No. 13, while Webb Simpson and Matt Kuchar kept their rankings from last week.

Jason Day, Dustin Johnson, Graeme McDowell and Bill Haas stayed in their positions, then Dufner rounded out the top 20.

Els, who battled through most of the winter to get high enough in the rankings to get into the Masters, rocketed up 23 with the runner-up finish. He is 40th and inside the top 50 for the first time in six months.

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