In 1984 Watson turned to sports cars racing, notably partnering Stefan Bellof to victory at the Fuji 1000 km during Bellof's 1984 Championship year.
En 1984, Watson volveu as carreiras de coches deportivos, en particular, acompañou a Stefan Bellof na vitoria nos 1000 km de Fuji durante o ano que Bellof gañou o campionato.