LAS VEGAS :McLaren's Formula One championship leader Lando Norris played down his chances of a third win in a row on Wednesday and said he expected Las Vegas to be trickier than his last two races in Mexico and Brazil. Norris leads Australian teammate Oscar Piastri by 24 points and is 49 clear of Red Bull's four-times world champion Max Verstappen with three rounds left but could struggle to continue his momentum in the Nevada city. The previous two editions of the Las Vegas Grand Prix have