Hagey, known by his nickname "Chico" which he has had since birth, was originally from Illinois but moved to San Diego at the age of nine and went to La Jolla High School.

[1][2] The national boys' championship winner in 1969, Hagey reached the number one junior ranking during the 1971 season.

[1] He attended Stanford University in the early 1970s and became a key member of the varsity tennis team, which won the Division 1 titles in 1973 and 1974.

[1] In the shortest possible tennis match, Hagey had to retire hurt after the first point when he plowed into the fence and broke his right leg, giving the win to Georges Goven.

[4] On the Grand Prix tennis circuit, the deepest Hagey reached in a singles draw was the semifinals at Hong Kong in 1976.