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 on SONOMA, Calif. (AP) Scott Dixon wins fourth IndyCar season title, beating Juan Pablo Montoya in tiebreaker.Published Aug 30, 2015 | Modified Aug 30, 2015SI STAFFShare on FacebookShare on XHome/Racing