Barcelona - World champion Lewis Hamilton had to pull out of the opening day of the second pre-season test in Barcelona due to a fever after completing just 11 laps.
The Englishman was replaced by Mercedes test driver Pascal Wehrlein, who had started the day testing Force India's car from the 2014 season.
Mercedes logged over 500 laps over four days in the first test of the season in Jerez and team principal Paddy Lowe explained they didn't call in Hamilton's teammate Nico Rosberg for the rest of the day so as to not overtax the German's workload with last season's runner-up in the world championship due to drive on Friday.