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
The Indy 500 poleman who didn't live to raceday 6pm, May 11, 1996: Scott Brayton takes pole for the Indianapolis 500. 12:17pm, May 17, 1996: Scott Brayton dies in a practice crash. MARK GLENDENNING shares his story IndyCar
Fast Failures: American heartbreak at the Indianapolis 500 A real American hero was lost from the history books within sight of the finish of the 1967 Indianapolis 500. MARK GLENDENNING revisits the infamous STP turbine Indycar IndyCar
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The key mistakes behind a lost Williams title Formula 1 history is full of should'ves, could'ves and would'ves, but it's easy to see 1991 as the greatest missed opportunity in the illustrious history of Williams, allowing Ayrton Senna to steal his last and perhaps greatest world championship title F1
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