Al Unser, one of only three four-time winners of the Indianapolis 500 (1970-71-78-87), posted a total of 48 wins in USAC National competition. A three-time USAC National Driving Champion, he also won the 1973 Silver Crown title and strung together a remarkable four consecutive Hoosier Hundred wins between 1970 and 1973. The 1978 International Race of Champions king, Al continues to lead all drivers in terms of Indianapolis 500 laps led at 612. He also won races in the USAC Stock Car and Formula 5000 Championship.