Running in fourth place, Vettel spun unchallenged as he went through Monza's Ascari Chicane – a second driving error in Ferrari's home race in as many years.
In Vettel's rush to get going once again, he stumbled onto the track and made contact with Stroll, who was spun to the exit of the chicane, and was then guilty of a similar incident which impacted Pierre Gasly.
Vettel was given a 10-second stop-go penalty and finished 13th, completing a miserable outing personally that contrasted greatly with Ferrari's race as Charles Leclerc secured the team's first Monza win since 2010.
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