Garnett enjoyed most of his tennis success while playing doubles. During his career he won 1 doubles title. He achieved a career-high doubles ranking of World No. 49 in 1993.
Garnett's highest singles ranking was World No. 203 which he reached April, 1989.
|Loss||0-1||1991||Charlotte, U.S.||Clay||Greg Van Emburgh|| Rick Leach
|3-6, 6-2, 3-6|
|Loss||0-2||1991||Guaruja, Brazil||Hard||Todd Nelson|| Jacco Eltingh
|Loss||0-3||1992||Charlotte, U.S.||Clay||Jared Palmer|| Steve DeVries
|Win||1-3||1992||Washington D.C., U.S.||Hard||Jared Palmer|| Ken Flach