Dixon is now only two championships from tying A.J. Foyt for most Indy car crowns. Dixon told NASCAR America on Tuesday he's already of title No. 6 next season.

IndyCar driver Scott Dixon explains why this championship was even more special, his strategy at Sonoma, and how he's processing his fifth IndyCar championship.

Scott Dixon captured his fifth career IndyCar championship in Sunday’s season-ending Grand Prix of Sonoma.

IndyCar driver Robert Wickens posted on Twitter a video thanking his fans for all their support and updated his condition now that he's in rehab after his scary crash.

Simon Pagenaud: 'I found my smile back, so that is a good thing.' He put a few smiles on his car owner Roger Penske's face as well.

There are very few open seats remaining for 2019.

For the final time of 2018, here's what drivers had to say after the IndyCar season finale.

Dixon is not only one of the best ever in IndyCar, he's also one of the most humble drivers the sport has ever seen.

Ryan Hunter-Reay began the season fifth in the standings and ended in fourth – but it was a rollercoaster in-between.

Here's what NBC's IndyCar announcers had to say about Scott Dixon's championship.

Alexander Rossi rebounded from opening lap contact with Marco Andretti to finish seventh, but it wasn't enough to beat Scott Dixon to the championship.

Scott Dixon is presented with the 2018 IndyCar championship trophy after the Grand Prix of Sonoma.

Ryan Hunter-Reay discusses his win at Sonoma on his wife's birthday and dedicates the win to his teammate who was injured at Pocono, Robert Wickens.

Alexander Rossi was unable to catch Scott Dixon this season, finishing second in the IndyCar Championship Standings.

Scott Dixon congratulates his crew and reacts to becoming only the second driver ever to win five IndyCar championships.

Ryan Hunter-Reay wins the 2018 Grand Prix of Sonoma, while Scott Dixon finishes in second and wins the IndyCar title.

Scott Dixon becomes only the second driver in IndyCar history to win five titles.

Scott Dixon continues to lead the championship as they run, but Alexander Rossi is charging back through the field after benefiting from a timely caution.

Alexander Rossi is trying to rebound from opening lap contact, while Josef Newgarden stalled in his first pit stop. Scott Dixon runs solidly in second after the opening stint.

Alexander Rossi suffered contact and a damaged front wing on the opening lap of the INDYCAR Grand Prix of Sonoma.

Robert Wickens continues to rehabilitate from injuries, and resulting surgeries, from his violent crash on August 19 at Pocono Raceway.

The 2018 Verizon IndyCar Series championship will be settled at the INDYCAR Grand Prix of Sonoma.

Takuma Sato will continue with Rahal Letterman Lanigan Racing in 2019.

Lewis Hamilton extends his championship lead over Sebastian Vettel to a commanding 40 points.

IndyCar ends a 14-year tenure of racing at Sonoma Raceway today.

Will you pick Scott Dixon, Alexander Rossi, Will Power or Josef Newgarden?

If Dixon wins a fifth championship, he would become one of only two drivers in IndyCar history that have reached that rare plateau.

Ryan Hunter-Reay won his first pole position since 2014 and stole a critical point from Scott Dixon at Sonoma.

Ryan Hunter-Reay was able to steal pole position away from Scott Dixon at the last second for Sunday’s INDYCAR Grand Prix of Sonoma.

If Scott Dixon wins Sunday's championship, it will be his fifth and will be the 12th IndyCar title as a team owner for his boss, Chip Ganassi.

Scott Dixon just missed out on pole for Sunday's INDYCAR Grand Prix of Sonoma, while a gamble on Firestone primary blacks failed to pan out for Alexander Rossi.

Saturday was the last qualifying session of the year for the IndyCar Series.

Even with a 29-point deficit heading into Sunday's final race of 2018, Rossi does not feel he'll be denied the championship.

Ryan Hunter-Reay took the pole position away from Scott Dixon on the final lap in the Firestone Fast Six. Alexander Rossi qualified sixth, while Patricio O'Ward continued to star, qualifying fifth.

The seven announcers who will bring you Sunday's championship-deciding Grand Prix of Sonoma give their thoughts on who they think will win the 2018 IndyCar title.

Points leader Scott Dixon topped the final practice before qualifying for Sunday's INDYCAR Grand Prix of Sonoma. Title rival Alexander Rossi ended the session in fourth.

Lewis Hamilton scored the pole for the Singapore Grand Prix while Sebastian Vettel settled for third.

Two practices down, one more plus qualifying on Saturday, and then it's Sunday's big season-ending and championship-deciding race at Sonoma Raceway.

Anders Krohn hits the paddock prior to the Grand Prix of Sonoma to check in with the likes of Alexander Rossi, Colton Herta, and Patricio O'Ward.

Katie Hargitt goes one-on-one with IndyCar's Tony Kanaan prior to the Grand Prix of Sonoma to find out the secret to his longevity in racing.

Patricio O'Ward and Colton Herta had solid starts to their Verizon IndyCar Series debuts on Friday.

Power is 87 points behind series leader Scott Dixon, but still believes he can rally to win the IndyCar title.

Josef Newgarden, who has been battling food poisoning this weekend, topped Practice 2 for Sunday's INDYCAR Grand Prix of Sonoma, while title combatants Scott Dixon and Alexander Rossi ranked second and...

Hammer will not only give the command to start engines, he'll also ride with Mario Andretti to bring the field to the green flag start of the race.

Kanaan will make his 300th consecutive start in Sundays 2018 IndyCar season-ending Grand Prix of Sonoma.

Andretti Autosport and Team Penske each had two drivers in the five fastest.

Red Bull driver Daniel Ricciardo posted the fastest time in the first practice for the Singapore Grand Prix on Friday.

The Singapore Grand Prix is the first of seven fly-away races to end the 2018 Formula 1 season.

The odds and numbers may be stacked against him, but Josef Newgarden isn't giving up hope that he can still win the championship this year.

In a sense, the 2018 IndyCar championship ran through San Francisco on Wednesday when the four remaining contenders took in the City by the Bay.