Pacific Raceways is a mixed-use road racing and drag racing facility near Kent, Washington. The race track was constructed in 1959 and opened in 1960. The track was originally named Kent Pacific Raceways, then became known as Seattle International Raceways in 1969. After the landowner regained control of the track in 2002, the name reverted to Pacific Raceways.

Alfred Unser was an American automobile racing driver, the younger brother of fellow racing drivers Jerry and Bobby Unser, and father of Al Unser Jr. He was the second of four men to have won the Indianapolis 500 four times, the fourth of five to have won the race in consecutive years, and the winner of the National Championship in 1970, 1983, and 1985. The Unser family has won the Indy 500 a record nine times. He was the only person to have both a sibling (Bobby) and child as fellow Indy 500 winners. Al's nephews Johnny and Robby Unser have also competed in that race. In 1971, he became the only driver to date to win the race on his birthday.