The Cajun Classic Open Invitational was a golf tournament in Louisiana on the PGA Tour in the late 1950s and 1960s, played at the Oakbourne Country Club in Lafayette, usually in late November. It debuted as the Lafayette Open Invitational in 1958, and in many years was the last tournament on the PGA Tour schedule, which attracted players fighting for position on the money list. John Barnum, the only man in the history of the PGA Tour to earn his first win after age 50, won this event in 1962 at age 51. Barnum was also the first player to win on Tour using a Ping putter.