(AP) — With a dominating drive on a day worth double points, Scott Dixon once again proved he is one of the greatest IndyCar drivers in open-wheel history. Dixon overcame long odds to grab his fourth championship by winning the season finale at Sonoma Raceway. Any contact left a scattering of debris, and one piece even flew over the grandstands and stuck a bystander. The inaugural race in New Orleans was a rainy mess, and the series couldn't get to Indianapolis Motor Speedway fast enough in May to begin preparing for its biggest event of the year. Rahal sliced Montoya's lead in the standings to just nine points with two races remaining, but he was wrecked early a week ago at Pocono to pretty much sink his chances. [...] the turnaround of single-car team Rahal Letterman Lanigan from barely competitive last year to championship contender was one of the highlights of the IndyCar season. Rahal is quietly helping to raise money for Wilson's family, just as he did in 2011 when he organized an auction that raised $627,203 for Wheldon's family. On Sunday, all the drivers posed in a group photo with a race-worn helmet they had committed to a Wilson auction.