Spa-Francorchamps, Belgium - Sebastian Vettel topped the timesheets from Ferrari team-mate Charles Leclerc in first practice for the Formula One Belgian Grand Prix on Friday.
Vettel posted a best 1 minute 44.574 seconds around the iconic 7.004 kilometres of the Spa-Francorchamps circuit, 0.214 seconds ahead of Leclerc.
Max Verstappen was third but 0.933 seconds behind in his Red Bull.
Mercedes had a low-key session with standings leader Lewis Hamilton sixth after suffering a throttle pedal problem early in the session and Valtteri Bottas, the day after extending his contract for next season, was one better in fifth.
The reigning world champions were using the medium rather than soft tyres however and will expect to improve in second practice later Friday.