But despite Ricciardo 's excitement just 18 cars -- instead of the full complement of 22 -- lined up here on the Texan grid . Nico Rosberg of Mercedes wins Austin Grand Prix in Austin , Austin . British driver held off teammate Nico Rosberg to extend championship lead . 22 cars instead of full 22 took part in race due financial difficulties at U.S. and Marussia .
Nico Rosberg of Mercedes wins Austin Grand Prix in Austin , Austin . British driver held off teammate Nico Rosberg to extend championship lead . 22 cars instead of full 22 took part in race due financial difficulties at U.S. and Marussia .