Max Verstappen joined a select group of Formula One greats with his fourth title in Las Vegas on Saturday but stretching the run to five in a row next year could be an even bigger, and more thrilling, battle. Just six drivers have won four championships and only Michael Schumacher managed five in succession with Ferrari from 2000 to 2004. Only two of them - Verstappen and Red Bull's Sebastian Vettel from 2010-2013 - have won their first four consecutively. Verstappen has led the standings since