Mezue ahịrịokwu na-esonụ: Mass mere nke abụọ na Jean-Pierre Jarier na Formula Two na Nivelles, na June 1973. Ọ gbara onye nke abụọ n'ọsọ nke mbụ ma bụrụ onye nke atọ n'ọsọ nke abụọ. Ọ gbara ọsọ nke mbụ ya na Formula One na 1973 German Grand Prix na Nürburgring. Mass bịara nke asaa na Surtees. Ọ gbara ụgbọala McLaren-Ford ruo n'ọkwa nke atọ na
1975 Brazil Grand Prix na Interlagos.