Indianapolis is the largest city in Indiana as well as the second-largest city in the Midwest. It also happens to be within eight-hours driving distance for 50% of the population of the United States. Indianapolis is largely known for hosting several notable sporting events annually, including the largest half marathon in the U.S. and the largest single-day sporting event in the world, the Indianapolis 500. The cars competing in the latter race are known as IndyCars as a reference to the event. As headquarters for the National Collegiate Athletic Association (NCAA), the city frequently hosts the Men’s and Women’s basketball tournaments.