Kobayashi made his Formula One debut at the 2009 Brazilian Grand Prix, following a complication to Glock's injury that was initially not detected. He qualified 11th in a chaotic session that lasted for over two and half hours and was red-flagged twice due to accidents caused by torrential rain. Early in the race, while running in sixth place, he held off for several laps a challenge by Jenson Button, who needed to finish well to clinch the world championship. He finished the race in tenth place, and was later promoted to ninth when Heikki Kovalainen was penalised. Button jokingly described Kobayashi as "absolutely crazy, very aggressive". He also competed in the 2009 Abu Dhabi Grand Prix, as Glock's injury had not healed sufficiently. Kobayashi qualified 12th and finished sixth, scoring his first World Championship points, in the inaugural day-night race in Abu Dhabi.