Thomas Spessard Cain (born October 11, 1958) is a former professional tennis player from the United States.

[2] From 1980 he competed professionally and in his first year on tour was a semi-finalist at the Columbus Open, a tournament on the Grand Prix circuit.

[3] Another upset win came against then world number 23 Mark Edmondson at the 1983 Stella Artois Championships in Queen's, London.

He won a Grand Prix doubles title at the 1983 South Orange Open, with Fritz Buehning.

[5] In both of his appearances at Wimbledon he had to retire hurt during his first round matches, against Tim Gullikson in 1983 and Miloslav Mečíř in 1984.