See main article: 1991 Norstar Bank Hamlet Challenge Cup.
Guy Forget and Jakob Hlasek were the defending champions, but lost in the quarterfinals to Eric Jelen and Carl-Uwe Steeb.
Eric Jelen and Carl-Uwe Steeb won in the final 0–6, 6–4, 7–6, against Doug Flach and Diego Nargiso.
Guy Forget / Jakob Hlasek (quarterfinals)
Jimmy Brown / Scott Melville (first round)
Nick Brown / 
Libor Pimek (first round) Bret Garnett / 
Jorge Lozano (semifinals)