New Zealander Scott Dixon snatched the IndyCar Championship from Juan Pablo Montoya by winning the season-ending Grand Prix of Sonoma in California.
Former F1 driver Montoya had topped the standings all season and the Colombian looked set for the title.
With the final race worth double points, Dixon was able to tie with Montoya in the championship and take the title on Sunday based on wins.
IndyCar also paid tribute to Briton Justin Wilson, who died last week.
The 37-year-old former F1 driver was struck by debris in the Pocono IndyCar 500 on 23 August and crashed into a wall.
Drivers from all teams lined up for a pre-race tribute to Wilson, linking arms in the pit lane while the British national anthem was played.
Meanwhile, Wilson's number 25 Honda car was driven by Spaniard Oriol Servia in Sunday's race, who finished 12th.
Going into the weekend, Montoya had led the standings by 47 points but Dixon's win meant he took a fourth IndyCar title having won three races to Montoya's two.
"We had a few ways to win the championship and we just threw it away," said Montoya. "We didn't close it."