Lando Norris is taking a title challenge to Max Verstappen in the final six races of the Formula 1 season, after winning the Singapore Grand Prix by a commanding margin. The McLaren driver crossed the line at the Marina Bay Street Circuit a full 20 seconds ahead of Verstappen, and it could have been larger had he not backed off towards the end. It was the first time Lando Norris had led on the opening lap of a race from pole and led every lap having built up a 25-second lead before his first pit stop. Former F1 driver and 2016 World Champion Nico Rosberg believes his speed in Singapore shows t…