Regazzoni's only appearance at the 24 Hours of Le Mans, although he did test for the 1972 event. For the following two years Regazzoni was a permanent fixture in Ferrari's sports car racing squad. With the new 312B-based 312P cars underneath him, Regazzoni regularly ran at or near the front of the field. Regularly partnered with Jacky Ickx, the pairing took second place in the BOAC 1000 km at Brands Hatch in 1971, and won the first heat during the Imola 500 km. Regazzoni also won the Kyalami 9 Hours race, this time in partnership with Brian Redman. Further successes followed in 1972, with second places at the 1000 km Buenos Aires, partnered again by Redman, and prestigious Spa 1000 km race. The high point of the season came when the Regazzoni/Ickx partnership won the Monza 1000 km race. With his departure from Ferrari during 1973, Regazzoni's sports car results dried up. His uncompetitive Alfa Romeo 33 TT was thoroughly outclassed by the Ferrari and Matra opposition. At the end of 1973 Ferrari withdrew from sports car racing, and Regazzoni's move to rejoin the Ferrari Formula One team in 1974 effectively ended his sports car career, as he could not then race for other manufacturers. Formula One 1970–72: Ferrari During the early races of the 1970 Formula One season Ferrari only entered one car, for Belgian Jacky Ickx, but at the fourth round in Belgium, the team decided to run a second car to try out some younger drivers. Italian Ignazio Giunti was given the second seat in Belgium, where he finished fourth, while Regazzoni took his place at the following round in the Netherlands, also finishing fourth. Giunti was back in the seat for the following Grand Prix in France, but finished fourteenth, three laps behind the winner and eventual 1970 World Champion Jochen Rindt. Regazzoni was back in the Ferrari for the British Grand Prix, where he finished fourth again, but this time Regazzoni kept the race seat. Four podium finishes followed for Regazzoni during the final six rounds of the 1970 season, including a win at Monza, Ferrari's home race. However, the race was overshadowed by the death of Championship leader Rindt, during qualifying for the race. A first pole position, at the final round in Mexico, capped a hugely successful first season in the top formula. Regazzoni finished third in the Drivers' Championship with 33 points,