Max Verstappen was fastest for Toro Rosso on the third morning of pre-season testing in Barcelona.
Verstappen topped the timesheets with a lap of 1:24.739, set on a set of super-soft Pirelli tyres just after midday.
The 17-year-old managed 60 laps of the Circuit de Catalunya, the most of any driver on a morning interrupted by intermittent rain.
Lewis Hamilton was second for Mercedes, lapping 1.2 seconds off the Dutchman’s session topping time on the medium tyres.
Sebastian Vettel completed 54 laps on route to third fastest, despite an early off at Turn 4 just minutes into the session.
Daniil Kvyat ended his first morning back in the Red Bull in fourth, as the team concentrated on pit stop practice.
Felipe Massa was fifth for Williams, and will hand over to Valtteri Bottas in the afternoon.
Mercedes reserve driver Pascal Wehrlein added 36 laps to his tally as he returned behind the wheel of the year-old Force India VJM07, while Pastor Maldonado was seventh for Lotus.
Jenson Button completed just 12 laps on Saturday morning, after McLaren encountered more problems.
The 2009 champion stopped out on track two hours into the morning’s running owing to a reported engine problem.
Marcus Ericsson spent most of the morning confined to the garage in the Sauber, but managed a late flurry of laps just ahead of the lunch break.
This article first appeared on Richland F1 – Image courtesy of Red Bull Content Pool