MONTMELO, SPAIN - MARCH 01: Nico Rosberg of Germany and Mercedes GP drives during day four of the final Formula One Winter Testing at Circuit de Catalunya on March 1, 2015 in Montmelo, Spain. (Photo by Mark Thompson/Getty Images)
MONTMELO, SPAIN - MARCH 01: Nico Rosberg of Germany and Mercedes GP drives during day four of the final Formula One Winter Testing at Circuit de Catalunya on March 1, 2015 in Montmelo, Spain. (Photo by Mark Thompson/Getty Images)