Waxad ku qortaa sii wadida faqradan - Walker waxaa la siiyay kursi Formula One ah oo buuxa si uu u wado Lotus 72 xilli ciyaareedkii 1972, isagoo ah darawalka labaad ee Emerson Fittipaldi. Markii xilli ciyaareedku sii socday, si kastaba ha noqotee, labada Walker iyo kooxduba waxay noqdeen kuwo aad u niyad jabsan. Kadib markii Lotus ay ogaatay in Walker uu tijaabiyay baabuur Formula 2 ah oo koox kale ah, waxaa laga saaray kooxda GP-ga Talyaaniga
iyo GP-ga Canada, halkaas oo lagu badalay Reine Wisell. Walker wuxuu dib ugu soo laabtay US GP, laakiin wuu ka fariistay.