Lewis Hamilton led the way for Mercedes as the team dominated the standings during the opening session for the Hungarian Grand Prix.
Following a damp opening 20 minutes, following overnight rain, Hamilton moved to the front with a time of 1:21.347 on the Super Soft tyres.
He finished 0.237s clear of team-mate Nico Rosberg, whose deal to remain with the squad until the end of 2018 was confirmed earlier on Friday.
Sebastian Vettel was 1.6s behind Hamilton in third place, having also spun at Turn 12 on a messy lap, while Ferrari team-mate Kimi Räikkönen bagged fourth spot.
Red Bull took fifth and sixth courtesy of Daniel Ricciardo and Max Verstappen, as McLaren finished seventh and eighth, with Fernando Alonso ahead of Jenson Button.
Both drivers spun during various stages of the session but were able to continue untroubled.
Romain Grosjean took ninth for Haas, ahead of Force India duo Sergio Pérez and Nico Hülkenberg.
Williams was a low-key 12th and 13th, Felipe Massa ahead of Valtteri Bottas, with Carlos Sainz in 14th for Toro Rosso.
Marcus Ericsson and Felipe Nasr were 15th and 17th for Sauber, the Brazilian saving a wild moment exiting the final corner, split by Ferrari youngster Charles Leclerc, conducting his second FP1 outing with Haas.
Esteban Ocon had another run out for Renault and was 18th, ahead of Daniil Kvyat, with a substantial gap back to Manor’s Rio Haryanto, who was 5.6s off the pace.
Pascal Wehrlein and Jolyon Palmer brought up the rear, completing only a handful of laps during the session.