Lewis Hamilton returned to action on the second day of testing in Barcelona after having to pull out of the test on Thursday.
The Mercedes driver completed just 11 laps on the opening day of work before he had to withdraw with a high fever.
Hamilton was replaced by reserve driver Pascal Wehrlein, while teammate Nico Rosberg rested after suffering an inflamed nerve on his neck.
It was Rosberg who kicked off today's test for Mercedes, Hamilton took over driving duties in the W06 when the action resumed after the lunch break.
Rosberg had completed 66 laps in the morning session.