Gianclaudio Giuseppe "Clay" Regazzoni was a Swiss racing driver. He competed in Formula One races from 1970 to 1980, winning five Grands Prix. His first win was the Italian Grand Prix at Monza in his debut season, driving for Ferrari. He remained with the Italian team until 1972. After a single season with BRM, Regazzoni returned to Ferrari for a further three years, 1974 to 1976. After finally leaving Ferrari at the end of 1976, Regazzoni joined the Ensign and Shadow teams, before moving to Williams in 1979, where he took the British team's first ever Grand Prix victory, the 1979 British Grand Prix at Silverstone.

The 1970 Formula One season was the 24th season of the Fédération Internationale de l'Automobile's Formula One motor racing. It featured the 21st World Championship of Drivers, the 13th International Cup for F1 Manufacturers and three non-championship races open to Formula One cars. The World Championship was contested over thirteen races between 7 March and 25 October.