Nico jumped behind the wheel of the single-seater at 12:00 Bahrain time, managing to complete 22 laps before the lunch brake.
81 more laps were completed by the German in the afternoon, with the team's program including a car setup evaluation, some long stints and qualifying simulations.
Nico Rosberg: “That was an incredible effort by the team and I'm really happy with our day's work. The Night shift crew recognized a strange sound from the engine while working on it during the night so we had to change it, which took a good few hours and meant we missed out on running for most of the morning. In the end I managed to do over 100 laps, so this was a very useful day of testing for me and I learned a lot in the process. The only problem was the conditions, with a lot of wind and blowing sand at some corners meaning that suddenly you could have almost no grip which was a bit difficult to manage.
Overall I can be really happy about my testing program, so a big thanks to everyone in the team both here and back at the two factories for the remarkable job they've done. As in the case for everybody, we still have a few reliability problems that definitely need to be sorted out before Australia, but in general I think that winter tests have been better than expected. After some work in the simulator next week I will fly to Melbourne on Friday, and I can't wait to be back in the car again.“
From the total of 103 laps that Nico did during the third day of testing, his best lap time was 1:33.484. This put him second on the time sheets and it was also the first time this year's pre-season testing that Mercedes-AMG Petronas exceeded 100 laps in a single day.