13 April

1926 André Testut born 1931 Dan Gurney born 1940 Mike Beuttler born 1949 Ricardo Zunino born 1958 Luigi Musso won the non-championship Syracuse Grand Prix 1969 Keith Holland won the non-championship Madrid Grand Prix 1975 Niki Lauda won the non-championship BRDC International Trophy 1986 Ayrton Senna won the Spanish Grand Prix 1997 Jacques Villeneuve won the Argentinian Grand Prix 2002 Desmond Titterington died