BARCELONA, Spain -- Max Verstappen topped the first day of in-season testing at the Circuit de Catalunya as all ten teams returned to action for the first time since Sunday's Spanish Grand Prix.
Tuesday was one of four in-season test days scheduled for 2018, with a second day at Barcelona on Wednesday and a further two days after the Hungarian Grand Prix in August. The tests see a mix of experienced and junior drivers take to the track together as at least two of the four days for each team have to be completed by a driver with less than three grands prix to their name.