1973 - IROC International Race of Champions - Maria Helena Fittipaldi, Riverside International raceway.
Emerson Fittipaldi (12) Formula One, David Pearson (9) Nascar. Porsche Carrera RSR
Mark Donohue, Bobby Unser, Peter Revson, George Follmer, Denny Hulme, A.J. Foyt, Richard "The King" Petty, Roger McCluskey, David Pearson, Gordon Johncock, Bobby Allison and Emerson Fittipaldi.
