Trevino, 40, had won the last Open played at Muirfield in 1972, successfully defending his 1971 title and ending the grand slam bid of Jack Nicklaus.[5] Nicklaus, also 40, tied for fourth. He won at Muirfield in 1966 and was runner-up by a stroke in 1972.
This was the first Open scheduled to end on a Sunday, with a Thursday start. The Open previously began on Wednesday and ended on Saturday. Prior to 1966, the final two rounds were scheduled for Friday. In 1970 and 1975, 18-hole playoffs were held on Sunday.