Points leader Scott Dixon made himself the fastest driver in the final practice session until IndyCar opens a new season in March 2019.
Josef Newgarden led a trio of Chevrolets in the top five of Practice 2 at Sonoma, including rookie Patricio O'Ward who was third fastest.
Ryan Hunter-Reay gave Andretti Autosport the fastest lap to open the 2018 INDYCAR Grand Prix of Sonoma weekend.
Even with his 29-point lead, Scott Dixon has to be careful to keep Alexander Rossi behind him during the final race of 2018.
Mazda Road to Indy graduates Pato O'Ward and Colton Herta will make their IndyCar debuts with Harding Racing at Sonoma Raceway.
The launch of a lightly edited IndyCar schedule for 2019 prompted Mark Miles to dive into the inner workings of creating the series' calendar.
The United States' lone purpose-built Grand Prix circuit, located in the Lone Star State, will host the second IndyCar race in 2019.
Recently crowned Indy Lights champion Pato O'Ward will get his first taste of an Indy car at Sonoma Raceway.
Will Power's return to Portland for the penultimate round of 2018 went horribly.
A perfect day and a major gain in the championship slipped away from Alexander Rossi during the first Grand Prix of Portland in 11 years.