Max Verstappen and Lewis Hamilton go into the final race of the season, Sunday's Abu Dhabi Grand Prix, level on points.
It is a remarkable situation that has only happened once before in the sport's 71-year history, when Emerson Fittipaldi and Clay Reggazoni entered the 1974 finale level.
In the modern era it is uncharted territory. The championship went to the final race of the season in 2003, 2006, 2007, 2008, 2010, 2012, 2014 and 2016, but on each occasion there was an outright points leader.
Though both drivers have 369.5 points, Verstappen leads the championship by virtue of the "countback" rule.