MONTMELO, SPAIN - FEBRUARY 22: Nico Rosberg of Germany and Mercedes GP drives during day four of Formula One Winter Testing at Circuit de Catalunya on February 22, 2015 in Montmelo, Spain. (Photo by Mark Thompson/Getty Images)
MONTMELO, SPAIN - FEBRUARY 22: Nico Rosberg of Germany and Mercedes GP drives during day four of Formula One Winter Testing at Circuit de Catalunya on February 22, 2015 in Montmelo, Spain. (Photo by Mark Thompson/Getty Images)