Ferrari did its soft-tyre qualifying simulation runs earlier than its main rivals, and was gradually shuffled back later initially leading the way, Leclerc and Vettel climbed straight back into the top of the timesheet by putting the sole laps of the session below 1m30s.
Leclerc’s 1m29.569s effort was the best of the session, leaving him 0.169s away from Vettel.
Mercedes drivers Lewis Hamilton and Valtteri Bottas both made lastditch attempts to reestablish the red cars, but Bottas ran wide at the final corner and ended up eight tenths down on Leclerc, while Hamilton was only slightly faster, finishing up on a 1m30.334s best, 0.765down on Leclerc.
Max Verstappen headed the way after the initial running, being the very first driver in the session to dive below 1m31s, but the Red Bull-Honda ended FP3 only appeared fastest, 1.390s off the pace, after failing to improve on his final run.
RedBull fought to switch the tender palate on for flying laps in FP2 and Verstappen’s team mate Pierre Gasly fought for speed again in FP3, ending up only 12th.
Late improvements from Romain Grosjean’s Haas, Nico Hulkenberg’s Renault and also the McLaren of both Lando Norris, who just made one operate on soft palate, vaulted them beforehand of Verstappen and into the gap between Ferrari and Mercedes.
The next McLaren of Carlos Sainz and Daniil Kvyat’s Toro Rosso, which temporarily topped the occasions early on, rounded out the top 10, ahead of Kimi Raikkonen’s Alfa Romeo-Ferrari.
Daniel Ricciardo has admitted lacking confidence in his own Renault and he again struggled, end up only 16th speediest, significantly more than seven tenths down on teammate Hulkenberg and also behind the Haas of both Kevin Magnussen and swaying Point group Lance Stroll and Sergio Perez.
Williams again mentioned the rear of the area, nearly 1.3s behind the 18th placed Alfa of Antonio Giovinazzi, but Robert Kubica improved to finish this session just 0.138s behind team mate George Russell.