Barcelona Testing – Kimi Raikkonen was fastest on the second day of pre-season testing, whilst other drivers broke out the supersofts for the first time.
The Finn did a 1:20.960 on the soft tyre, eight tenths of a second quicker than Lewis Hamilton’s fastest time from the first day of testing.
He also managed to complete 108 laps, making it the second day in a row Ferrari have completed over a century of laps in a single test day.
Hamilton was fastest in the morning session with his time on the supersoft tyre, and was just two hundredths off Raikkonen by the end of the day.
He debuted the double T-wing for Mercedes, a further development of rear bodywork aerodynamics, before Bottas took over in the afternoon.
The Finn was the first driver to complete a full race simulation on only the second day of testing, although he did have a big moment at Turn 9 which he only just managed to recover from before hitting the barriers.
Bottas went on to complete over 100 laps, meaning the Mercedes duo clocked 167 laps by the end of the session.
Max Verstappen was third on the soft tyre, ahead of Kevin Magnussen who also completed over 100 laps for Haas, finishing the session with a best time of 1:22.204 set on the supersoft tyre.
Esteban Ocon was fifth on the supersofts, but the Frenchman did not make it out of the garage for the first two hours of running whilst the team repaired the exhuast problem that kept Sergio Perez in the garage for the majority of the afternoon on day one.
Ocon caused the second red flag of the day right at the end of the morning session when his Force India stopped at Turn 10.
The session was extended by five minutes, which gave Jolyon Palmer and Antonio Giovinazzi a chance to put in some much-needed mileage before the lunch break.
Palmer only did one installation lap in the morning session whilst Giovinazzi, standing in for the injured Pascal Wehrlein, had to wait for his Ferrari power unit to be changed before he could get on track.
The Italian was the first to leave the garage in the afternoon session. But, before he even completed an installation lap, he briefly brought out the third and final red flag of the day before managing to get the Sauber going again and bringing it back to the pits.
A highly productive remainder of the day saw allowed him to clock 66 laps by the end of the session, whilst Palmer managed to bring his lap tally up to 53.
Daniil Kvyat was sixth using the soft tyre on his first day in the Toro Rosso, clocking 68 laps but he appeared to have some issues as he had limited running in the afternoon.
McLaren had another troubled day, as Vandoorne first stopped on the pit lane entry and needed his mechanics to push him into the garage.
After only 29 laps of running however, the team revealed that an entire power unit change was required. It would be the second in as many days.
Vandoorne only managed to return to the track for the final hour of the session, in which he did not complete much meaningful running.
Lance Stroll’s first public outing in a Formula One car was not his best showing as he spun the FW40 on the exit of Turn 9, running through the gravel and bringing out the red flags.
He broke a piece of his front wing and, without any spares, Williams were forced to cut Stroll’s running early after just 12 laps, losing the entire afternoon.