Pascal Wehrlein hailed a "really good" first day with his new Manor team as he gave the MRT05 its track debut at the Circuit de Barcelona-Catalunya.
Wehrlein completed the first laps in Manor's new car and ended the day ninth quickest, having racked up 54 laps.
"A really good first day with the car and for me, so I’m very happy," said Wehrlein.
"I have a great car that’s as good to drive as it is to look at and already we’ve started to make some progress.
"This morning we completed just five laps while we worked with Mercedes HPP to make sure everything was as it should be.
"This afternoon we started to get into the programme and I added another 49 laps, so 54 laps in total. It’s a really promising package so I can’t wait to drive again in the morning.
"Thanks to the team for making me so welcome. Manor Racing is already feeling a lot like home."