What German rally and auto racing driver, born on March 7, 1947 was beaten at the World Rally Championship while attempting to defend his title as World Champion?
1983 World Rally Championship:  Audi's Hannu Mikkola beat the defending world champion Walter Röhrl and his Lancia teammate Markku Alén to the drivers' title. Walter Röhrl: Walter Röhrl (born 7 March 1947) is a German rally and auto racing driver, with victories for Fiat, Opel, Lancia and Audi as well as Porsche, Ford and BMW.
i don't know