Three rounds of the 1975 series were championship races co-sanctioned by the United States Auto Club.
Formula One | 1975 | World Rally Championship | World Championship | NCAA Men's Division I Basketball Championship | Ultimate Fighting Championship | World Championship Wrestling | 1975 in music | USAC | World Touring Car Championship | Six Nations Championship | Formula Two | County Championship | British Touring Car Championship | 5000 metres | World Chess Championship | national championship | All-Ireland Senior Hurling Championship | Football League Championship | Extreme Championship Wrestling | Bowl Championship Series | Championship | All-Ireland Senior Football Championship | 2005 World Touring Car Championship season | The Open Championship | World Sportscar Championship | 2010 FIBA World Championship | IMSA GT Championship | European Touring Car Championship | European Championship |