December 21, 2021 Al Unser was one of the greatest drivers in Indianapolis 500 history. When he won his fourth Indianapolis 500 in 1987, he joined AJ Foyt as the only drivers to win the famed race four times in a career at that time. Since then, Rick Mears joined them as a four-time winner in 1991 and Helio Castroneves won his fourth Indianapolis 500 on May 30.Pit Pass Indy show host Bruce Martin pays tribute to Unser, who died from a rare form of cancer on December 9. Unser was 82.In addition to winning four Indy 500s, Unser also won three INDYCAR National Championships and scored an impressive 39 victories. In addition to his outstanding IndyCar record, Unser also finished fourth in the 1968 Daytona 500 NASCAR race and had another fourth-place finish in a NASCAR race at Riverside, California in 1969.Racing legends Mario Andretti and Rick Mears join show host Bruce Martin to remember the great Al Unser on this edition of Pit Pass Indy. For more INDYCAR coverage, follow Bruce Martin at Twitter at @BruceMartin_500