World champion Lewis Hamilton hammered out an early season warning to his rivals on Wednesday when he set the fastest time on the opening day of pre-season testing at Barcelona.
Hamilton, who will attempt to equal Michael Schumacher's all-time record of seven world titles this year, clocked a best time of 1min 16.976sec off a total of 94 laps.
He was the only driver at a chilly Montmelo to duck under 1min 17sec. Worryingly for the rest of the field, Mercedes teammate Valtteri Bottas was second fastest in 1min 17.313sec.
Testing continues Thursday and Friday before a second three-day session in Barcelona next week. The season-opening Australian Grand Prix takes place in Melbourne on March 15.
First day test times:
Lewis Hamilton (GBR/Mercedes) 1:16.976 (94 laps)
Valtteri Bottas (FIN/Mercedes) 1:17.313 (79)
Sergio Perez (MEX/Racing Point-Mercedes) 1:17.375 (58)
Max Verstappen (NED/Red Bull-Honda) 1:17.516 (168)
Daniil Kvyat (RUS/Alpha Tauri-Honda) 1:17.698 (116)
Carlos Sainz (ESP/McLaren-Renault) 1:17.842 (161)
Daniel Ricciardo (AUS/Renault) 1:17.873 (56)
Esteban Ocon (FRA/Renault) 1:18.004 (62)
George Russell (GBR/Williams-Mercedes) 1:18.168 (73)
Lance Stroll (CAN/Racing Point-Mercedes) 1:18.282 (52)
Charles Leclerc (MON/Ferrari) 1:18.289 (132)
Nicholas Latifi (CAN/Williams-Mercedes) 1:18.382 (63)
Robert Kubica (POL/Alfa Romeo Racing-Ferrari) 1:18.386 (59)
Kevin Magnussen (DEN/Haas-Ferrari) 1:18.466 (106)
Antonio Giovinazzi (ITA/Alfa Romeo Racing-Ferrari) 1:20.096 (79)