Sebastian Vettel says Ferrari took "too long" to wake up to the fact that it had lost its way with recent car developments.
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Defending Super GT champion Nick Cassidy believes the experience he gained last year could prove crucial in his title battle with ex-Formula 1 star Jenson Button and Naoki Yamamoto.
Kimi Raikkonen's second stint at Ferrari has been characterised by dropping the ball at key moments and costing himself chances to win races. At Austin he passed every test to end a wait of more than 100 races to return to the top of the podium.
Team Penske is left with only Joey Logano in the 2018 title hunt as Brad Keselowski and Ryan Blaney were eliminated at Kansas Speedway.
Esteban Ocon has been disqualified from his eighth-place finish in the United States Grand Prix after his car was found to have breached Formula 1's fuel flow limits.
Chase Elliott felt the pressure in the closing laps, but emerged victorious at Kansas as the playoff field was cut from 12 down to eight.
United States Grand Prix winner Kimi Raikkonen believes he has "proved some people wrong" after claiming his first Formula 1 victory in five and a half years.
Mercedes Formula 1 driver Lewis Hamilton admits he and the team “made it hard for ourselves” in committing to an inferior United States Grand Prix strategy compared to his nearest rivals.