Australia's Formula One star Oscar Piastri has started the Las Vegas Grand Prix well off the pace, as McLaren teammate Lando Norris took the early honours before a red flag ended practice early.
Championship leader Norris clocked a lap time of 1:33.602 seconds to go fastest in the second red-flagged practice session on Friday (AEDT), while Piastri was 14th.
Mercedes rookie Kimi Antonelli trailed Norris by 0.029 seconds, with Ferrari driver Charles Leclerc third-fastest before suffering a gearbox issue with less than four minutes on the clock.
