Hall of Fame sprint car driver Bobby Unser is in Knoxville this week for the Sprint Car Hall of Fame Induction this weekend. Unser was inducted into the Hall of Fame in 1997, but was unable to attend at the time, so this will be his first induction ceremony. The Unser name is world-renowned in racing. Bobby is a three-time Indianapolis 500 winner, and his brother Al and nephew Al, Jr. both have won the 500 as well. Bobby spent much of his career racing on the United States Auto Club Sprint Car circuit.