A nail-biting championship finale and an unlikely champion capped off a gripping IndyCar title battle. MARK GLENDENNING rates the season's best

The 2015 IndyCar season will forever be overshadowed by the loss of Justin Wilson, in a tragic accident that rocked the series and re-opened a long-running debate on driver safety.

After Pocono, though, came Sonoma - a championship finale that yielded an unlikely champion - and, as AUTOSPORT's IndyCar correspondent Mark Glendenning explains, a surprise number one in his yearly driver ratings.

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