Kammala jumla mai zuwa: Mass ya zama na biyu ga Jean-Pierre Jarier a tseren Formula Two a Nivelles, a watan Yunin 1973. Ya gama na biyu a zagayen farko kuma na uku a na biyu. Ya kammala tserensa na farko na Formula One a 1973 Grand Prix na Jamus a Nürburgring. Mass ya zo na bakwai a cikin Surtees. Ya tuka McLaren-Ford zuwa matsayi na uku a
Babban Gasar Brazil ta 1975 a Interlagos.