LAS VEGAS : Australian Oscar Piastri has set his sights on victory in Las Vegas now that McLaren team mate Lando Norris's Formula One title hopes have receded. Norris is the main challenger to Red Bull's Max Verstappen, who will be sure of a fourth successive title this weekend if he beats the Briton. Piastri has of late played a supporting role in the championship but the focus is now more on the constructors' championship, with McLaren leading Ferrari by 36 points and three rounds remaining. "