The Scuderia were vastly outperformed in Barcelona's third sector a fortnight ago – generally a signifier of Monaco success.
Further down the grid a few teams had a troublesome session, especially Haas who saw Romain Grosjean and Kevin Magnussen black-flagged after the team's telemetry and radio failed, prompting the FIA to step in. Both drivers emerged for the final moments of the session.
Carlos Sainz was consigned to the garage for the session due to an electronics issue, putting McLaren's mechanics to work.
Monaco GP FP1 results
1. Lewis Hamilton (Mercedes) 1:12.106 - 47 laps
2. Max Verstappen (Red Bull) 1:12.165 - 35 laps
3. Valtteri Bottas (Mercedes) 1:12.178 - 43 laps
4. Charles Leclerc (Ferrari) 1:12.467 - 25 laps
5. Sebastian Vettel (Ferrari) 1:12.823 - 36 laps
6. Pierre Gasly (Red Bull) 1:13.170 - 41 laps
7. Nico Hulkenberg (Renault) 1:13.227 - 45 laps
8. Kevin Magnussen (Haas) 1:13.232 - 24 laps
9. Kimi Raikkonen (Alfa Romeo) 1:13.363 - 39 laps
10. Romain Grosjean (Haas) 1:13.379 - 40 laps
11. Daniel Ricciardo (Renault) 1:13.413 - 45 laps
12. Antonio Giovinazzi (Alfa Romeo) 1:13.437 - 39 laps
13. Daniil Kvyat (Toro Rosso) 1:13.731 - 40 laps
14. Alexander Albon (Toro Rosso) 1:13.827 - 45 laps
15. Lando Norris (McLaren) 1:14.278 - 39 laps
16. Sergio Perez (Racing Point) 1:14.566 - 40 laps
17. George Russell (Williams) 1:15.115 - 40 laps
18. Robert Kubica (Williams) 1:15.514 - 24 laps
19. Lance Stroll (Racing Point) 1:16.135 - 37 laps
20. Carlos Sainz (McLaren) 2:00.670 - 4 laps
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