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AUSTIN, TX - OCTOBER 25: Nico Rosberg of Germany and Mercedes GP shows his dejection on the podium after his team-mate Lewis Hamilton of Great Britain and Mercedes GP won winning the United States Formula One Grand Prix and the championship at Circuit of The Americas on October 25, 2015 in Austin, United States. (Photo by Dan Istitene/Getty Images)

AUSTIN, TX - OCTOBER 25:  Nico Rosberg of Germany and Mercedes GP shows his dejection on the podium after his team-mate Lewis Hamilton of Great Britain and Mercedes GP won winning the United States Formula One Grand Prix and the championship at Circuit of The Americas on October 25, 2015 in Austin, United States.  (Photo by Dan Istitene/Getty Images)