Max Verstappen received his first day of action in Red Bull's RB12 at the Spanish Grand Prix following his promotion from Toro Rosso.
Verstappen has been moved up to the senior team after just 23 Grands Prix and set the sixth quickest time during the second practice at the Circuit de Barcelona-Catalunya.
"I’m happy; for a first day you can’t complain," he said.
"We got through a lot of work and did a lot of laps and I think that’s the most important thing for me at the moment.
"I’m still getting used to the car, I don’t feel its full limit yet. It’s a new car, but I wasn’t nervous this morning, I just wanted to experience the car, I was eager to just go out and drive.
"I’m still learning a lot about the car; the seat position, the steering wheel position, all the switches and the procedures are all completely different to the Toro Rosso, but we are working on it and it’s getting better and better."