Scott Dixon wins fourth IndyCar season title, beating Juan Pablo Montoya in tiebreakerSONOMA, Calif. (AP) Scott Dixon wins fourth IndyCar season title, beating Juan Pablo Montoya in tiebreaker.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceSONOMA, Calif. (AP) Scott Dixon wins fourth IndyCar season title, beating Juan Pablo Montoya in tiebreaker.Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Aug 30, 2015 | Modified Aug 30, 2015SI STAFFShare on FacebookShare on XHome/Racing