Mercedes driver Lewis Hamilton set the pace during the opening day of pre-season testing in Barcelona, clocking the Spanish circuit in 1:21.765s.
The Englishman took over the W07 Hybrid from new teammate Valtteri Bottas after the lunch break, completing a total of 73 laps in the afternoon session.
Bottas got similar mileage in the morning, taking Mercedes’ grand total to 152 - higher than any other team on the grid.
Much like Mercedes, Ferrari also had a trouble-free day with Sebastian Vettel clocking 128 laps to end the session as second fastest. His lap time, a 1:21.878, however, was set on Pirelli’s slower medium tyre.
Williams’ returnee Felipe Massa ended the day as third fastest, three tenths behind Hamilton’s benchmark.
Kevin Magnussen was fourth fastest in the session despite two separate incidents on his debut outing for Haas. The Dane’s VF-17 came to a halt at the pit exit early in the day, before he damaged the front wing in an accident at turn 10.
Red Bull, too, had their own issues with Daniel Ricciardo’s RB13 suffering from a sensor issue in the morning. The Australian, however, was able to bounce from the problems and finish fifth in the timesheets.
The aforementioned Bottas was sixth fastest, while Force India’s Sergio Perez was classified seventh.
Carlos Sainz was eighth for Toro Rosso, while new Renault recruit Nico Hulkenberg finished the session in ninth.
McLaren’s 2017 season got off to a difficult start with its Honda engine suffering an oil leak early in the morning. After spending majority of the day in the garage, Fernando Alonso was finally able to get going and notch 29 laps in the orange-liveried MCL32.
Marcus Ericsson propped up the timesheets for Sauber, setting his best time on the medium rubber.