The 1955 race began at 4 pm on Saturday, and, as predicted, the lead cars of Eugenio Castellotti (Ferrari), Hawthorn (Jaguar), and Fangio (Mercedes-Benz) were at the head of the field in the first hour. The other team cars were being kept on tighter leashes to conserve the cars, but still racing in the top ten. Going into the second hour, Castellotti started dropping back, but Hawthorn and Fangio continued the duel, swapping the lead and dropping the lap record further and further, lapping most of the field.