The Chicago Open also known as the Volvo Chicago Open, its sponsored name is a defunct professional tennis tournament founded in 1973 as the Chicago International until 1975 both events were played on indoor carpet courts. This initial tournament and this event were part of the Grand Prix circuit. It was held annually at the UIC Pavilion in Chicago, Illinois, US, from 1985 to 1987. It is unrelated to a World Championship Tennis event held in Chicago for one year in 1982.