Jason Dufner, who made a 25-foot birdie putt on No. 18 in regulation, slid a 40-footer past when he and Scott played the 18th hole for the second time during the playoff. Scott then made the 7-footer for his 11th PGA Tour victory.
The major champions parred the 18th to start the playoff, then matched birdies at the 17th hole. Dufner, who won the PGA Championship last year, hit his approach there pin high to 4½ feet, but 2013 Masters champ Scott drained a 14-foot birdie before Dufner putted.
Scott and Duffer both shot 4-under 66 to finish at 9 under, the highest winning score at Colonial since 1999.
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