[1] O'Day received a gold medal in the 5.5 Metre class at the 1960 Summer Olympics in Rome.

[2] He won the world champion title twelve times in various classes.

He was Assistant Helmsman on two successful defenses of the Americas Cup, Weatherly in 1962 and Intrepid in 1967.

The same year, together with the English boat designer Uffa Fox, O'Day co-designed the Day Sailer.

This article about a yacht racing Olympic medalist of the United States is a stub.