Kammala jumla mai zuwa: A shekara ta 1952, Kavanagh ya zama dan Australia na farko da ya lashe tseren babur na Grand Prix lokacin da ya lashe 350cc Ulster Grand Prix. A cikin 1956, ya ci Junior TT a Isle of Man TT tsere. Kavanagh ya shiga cikin Formula One Grand Prix guda biyu a 1958 tare da nasa Maserati 250F, da farko a
Monaco inda ya kasa cancanta, kuma a ƙarshe a Grand Prix na Belgium inda ya rasa tseren da ya busa injinsa a cikin gwaji, bayan ya cancanci 20th na 28 masu shiga.