Vettel set 1m18.161s in the morning session at & # 39; C3 & # 39; wheel, 1.783 seconds faster than his closest rival Sergio Perez in the Racing Point car.
While he did not improve his laptime in the afternoon, Vettel added his lap count to 169 at the end of the day, enough to head the mileage rank as well, though his margin in the field was reduced.
Romain Grosjean reduced Vettel's advantage over a second, with a late lap on the C3 wheel in the last half-hour snatching second spot from Carlos Sainz.
However, McLaren Sainz's driver ended up with 1m18.558s on the Vettel trail by just 0.397s.
Sainz helped to release the first red flag of the afternoon when he stopped at the pitlane exit at the start of the run. He blames a loss of power for the issue, and the car appears to run smoothly afterwards.
Grosjean has to live for the third fastest time, but Haas has a better afternoon. Grosjean's car stopped entering the last chicane with fuel pressure issues earlier in the day.
Max Bull-Honda Max Verstappen got 1
Alfa Romeo is still one of the teams to log more than 100 laps, despite Raikkonen visiting gravel carrying the first red flag of the session in the morning. His car stopped just a moment in the split session, which resulted in another red flag.
The Toro Rosso of Daniil Kvyat and Perez took the sixth and seventh fastest times respectively, but both teams are likely to want more operation.
Kvyat had to bolt the C4 wheel to set his best time, while Perez added 10 laps to the 20th he completed in the morning, with his team ending under laps-completion order.
After taking over Mercedes in the afternoon, the reigning champion Lewis Hamilton did not beat Valtteri Bottas's eighth place in the day-to-day sequence, but completed more laps at 81.  Behind the Mercedes pair, Renault was disappointing
Renault's new driver Daniel Ricciardo was taken from Nico Hulkenberg for the afternoon, but did not get defeated at Hulkenberg's 0.003s.