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Williamson has no PGA Tour victories, although he has finished 2nd twice, both playoff losses – to Hunter Mahan at the 2007 Travelers Championship, and to Kenny Perry at the 2008 John Deere Classic.
On July 14, Spieth won the John Deere Classic in a three-way, sudden-death playoff on the fifth playoff hole against defending champion Zach Johnson and David Hearn.