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