The McLaren M20 was a sports prototype developed by McLaren for the 1972 season of the Canadian-American Challenge Cup. It served as a replacement for the team's M8Fs, but it later became the final Can-Am design created by McLaren before the team left the series after failing to secure the 1972 championship title. M20s continued to be entered by private teams until the Can-Am championship was canceled at the conclusion of the 1974 season. McLaren driver Denny Hulme won two races during the 1972 season while Scooter Patrick won a single event in 1974 with a privately entered M20.

When McLaren designed their replacement for 1971's M8Fs, one of the team's primary goals was to improve the cooling structure of the cars in order to allow their racing drivers, Denny Hulme and Peter Revson, more comfort during races. The M8F, as with previous McLaren sports cars, featured a large radiator mounted in the nose of the car, through which air was drawn from openings in the nose, and exited upwards over the open cockpit. McLaren designers Gordon Coppuck and Tyler Alexander devised a solution to this heat problem by using two radiators, one each mounted on either side of the cockpit, and drawing air from the side of the bodywork. This meant that hot air exiting the radiator no longer passed over the cockpit, and decreased fatigue on the drivers.

Mario Gabriele Andretti (born February 28, 1940) is a retired Italian American world champion racing driver, one of the most successful Americans in the history of the sport. He is one of only two drivers to win races in Formula One, IndyCar, World Sportscar Championship and NASCAR (the other being Dan Gurney). He also won races in midget cars, and sprint cars. During his career, Andretti won the 1978 Formula One World Championship, four IndyCar titles (three under USAC-sanctioning, one under CART), and IROC VI. To date, he remains the only driver ever to win the Indianapolis 500 (1969), Daytona 500 (1967) and the Formula One World Championship, and, along with Juan Pablo Montoya, the only driver to have won a race in the NASCAR Sprint Cup Series, Formula One, and an Indianapolis 500. No American has won a Formula One race since Andretti's victory at the 1978 Dutch Grand Prix. Andretti had 109 career wins on major circuits.

Andretti had a long career in racing. He was the only person to be named United States Driver of the Year in three decades (1967, 1978, and 1984). He was also one of only three drivers to win races on road courses, paved ovals, and dirt tracks in one season, a feat that he accomplished four times. With his final IndyCar win in April 1993, Andretti became the first driver to win IndyCar races in four different decades and the first to win automobile races of any kind in five.