The 1866 Open Championship was the seventh Open Championship and was held on 13 September at Prestwick Golf Club. Willie Park, Sr. won the championship for the third time, by two shots from his brother Davie Park. There were 16 competitors. The Open 1866: September 13–13, 1866 at Prestwick Golf Club. Champion: Willie Park, Sr., at 169 — 3rd major title. Wiki link