Starting Position: 20
Race Time: 3:04:59.147
Chassis/engine: March/Cosworth
Mario Andretti was well on his way to finally backing up his 1969 victory, but it was not to be. His Newman Haas Lola slowed with 23 laps to go, handing the lead to Big Al for the upset win, making him just the 2nd four-time winner at Indianapolis. Unser was not scheduled to compete in this race, but after Penske driver Danny Ongais was injured in practice, Unser was drafted to replace him. The backup chassis had been previously retired and had to be retrieved from a hotel lobby where it was on display before achieving Indy 500 glory.