One of the biggest stories that broke during the two-week gap before the Las Vegas Grand Prix was that Niels Wittich, the former race director in Formula 1, was to be leaving his post. There is still no real clarity on whether he left the job by his own choice, or whether he was sacked, with Sergio Perez believing it was the latter. What we do know for certain is that Wittich's replacement will be former Formula 2 and Formula 3 race director Rui Marques, and his first race will be in the 'Sin City' this weekend.