Arturo Merzario
As well as single seater racing, Regazzoni participated in sports car racing, including the 1970 24 Hours of Le Mans where he and Arturo Merzario raced a Ferrari 512S. However, the pair retired after completing only 38 laps. This would prove to be Regazzoni's only appearance at the 24 Hours of Le Mans, although he did test for the 1972 event.