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.
1 GRAHAM RAHAL
Team Rahal Letterman Lanigan Racing
Starts 16
Wins 2
Position 4th