Las Vegas Grand Prix organisers have ruled out one day following Formula One's other U.S. rounds in Austin and Miami and switching to a sprint format.The 100km race, a day before the main event, is aimed at providing more racing entertainment for fans but the Las Vegas GP is already on a Saturday and last year featured more overtaking than any other round.

Formula 1 race director Niels Wittich will be replaced in a surprise move with three races to go and the title yet to be decided. The series' governing body, the FIA, said on Tuesday that Wittich had “stepped down” and would be replaced starting from next week's Las Vegas Grand Prix by Rui Marques,

Formula One race director Niels Wittich has stepped down with immediate effect and Rui Marques will take over the role from next week's Las Vegas Grand Prix, the governing FIA said on Tuesday.