Lewis Hamilton topped the timesheets by a tenth of a second from Max Verstappen an Sebastian Vettel as the championship leader looked to have shaken off his Hockenheim hangover in first practice for the Hungarian Grand Prix.
All three leading constructors were in close quarters in terms of lap time to start the Budapest weekend.
Ferrari showed impressive strength in the first sector, despite the SF90 having been predicted to struggle around one of the lower-speed circuits on the calendar.
Although Hamilton led the way, there was concern for the Silver Arrows as Valtteri Bottas spent almost the entire session in the garage after a power unit issue was found on the Finn's car. The team made a change, which will not incur Bottas any grid penalties.
Rain sprinkled the track early on and many drivers struggled with grip, notably Verstappen, who caught two spins in the session.
Hungarian GP FP1 results
1. Lewis Hamilton (Mercedes) 1:17.233
2. Max Verstappen (Red Bull) 1:17.398
3. Sebastian Vettel (Ferrari) 1:17.399
4. Pierre Gasly (Red Bull) 1:17.682
5. Kevin Magnussen (Haas) 1:17.942
6. Charles Leclerc (Ferrari) 1:18.188
7. Nico Hulkenberg (Renault) 1:18.417
8. Lando Norris (McLaren) 1:18.531
9. Carlos Sainz (McLaren) 1:18.702
10. Kimi Raikkonen (Alfa Romeo) 1:18.787
11. Daniel Ricciardo (Renault) 1:18.894
12. Romain Grosjean (Haas) 1:18.973
13. Daniil Kvyat (Toro Rosso) 1:18.982
14. Alexander Albon (Toro Rosso) 1:19.223
15. Sergio Perez (Racing Point) 1:19.325
16. Antonio Giovinazzi (Alfa Romeo) 1:19.488
17. George Russell (Williams) 1:19.649
18. Lance Stroll (Racing Point) 1:19.722
19. Robert Kubica (Williams) 1:20.322
20. Valtteri Bottas (Mercedes) NO TIME
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