Rubuta ci gaba ga wannan sakin layi - An ba Walker cikakken lokaci Formula One wurin zama don tuka Lotus 72 a cikin kakar 1972, a matsayin lamba biyu direba zuwa Emerson Fittipaldi. Yayin da kakar wasa ta ci gaba, duk da haka, duka Walker da ƙungiyar sun zama masu ɓacin rai. Bayan Lotus ya gano Walker ya gwada motar Formula Two don wata ƙungiyar, an cire shi daga ƙungiyar don GP na Italiya
da kuma GP na Kanada, inda aka maye gurbinsa da Reine Wisell. Walker ya dawo ne domin gasar US GP, amma ya yi ritaya.