Sementara itu, Ferrari di sesi pertama ini masih belum bisa secepat Mercedes.
Duo Mercedes menjadi pembalap tercepat, Valtteri Bottas berada di posisi pertama dan Lewis Hamilton berada di posisi kedua.
Seperti ini hasil lengkap FP1 GP F1 Spanyol 2018.
1. Valtteri Bottas | FIN | Mercedes AMG Petronas Motorsport | 1m 18.148s
2. Lewis Hamilton | GBR | Mercedes AMG Petronas Motorsport | 1m 18.997s
3. Sebastian Vettel | GER | Scuderia Ferrari | 1m 19.098s
4. Max Verstappen | NED | Aston Martin Red Bull Racing | 1m 19.187s
5. Kimi Raikkonen | FIN | Scuderia Ferrari | 1m 19.499s
6. Fernando Alonso | ESP | McLaren F1 Team | 1m 19.858s
7. Daniel Ricciardo | AUS | Aston Martin Red Bull Racing | 1m 19.871s
8. Romain Grosjean | FRA | Haas F1 Team | 1m 19.906s
9. Stoffel Vandoorne | BEL | McLaren F1 Team | 1m 20.083s
10. Pierre Gasly | FRA | Red Bull Toro Rosso Honda | 1m 20.508s
11. Kevin Magnussen | DEN | Haas F1 Team | 1m 20.637s
12. Charles Leclerc | MON | Alfa Romeo Sauber F1 Team | 1m 20.665s
13. Sergio Perez | MEX | Sahara Force India F1 Team | 1m 20.924s
14. Marcus Ericsson | SWE | Alfa Romeo Sauber F1 Team | 1m 20.984s
15. Carlos Sainz Jr. | ESP | Renault Sport Formula One Team | 1m 21.053s
16. Esteban Ocon | FRA | Sahara Force India F1 Team | 1m 21.144s
17. Nico Hulkenberg | GER | Renault Sport Formula One Team | 1m 21.159s
18. Brendon Hartley | NZL | Red Bull Toro Rosso Honda | 1m 21.373s
19. Robert Kubica | POL | Williams Martini Racing | 1m 21.510s*
20. Lance Stroll | CAN | Williams Martini Racing | 1m 22.756s
*Hanya di FP1