The Illinois Open Championship is a golf tournament that is administered by the Illinois PGA (Professional Golfers' Association). The state championship of golf is a 54-hole championship over three days to determine the finest player in the state of Illinois. The tournament is open to professionals and amateurs with a handicap of 10 or less who reside within the state of Illinois. In 2015, for the first time in the history of the Illinois Open, the Illinois PGA changed the format of the event having it contested at two facilities for the first and second rounds.