Final score 6–3, 7–5 | ||
David Wheaton was the defending champion, but lost in the quarterfinals this year.
Jaime Yzaga won the title, defeating Jimmy Arias 6–3, 7–5 in the final.
Seeds
A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
References
1991 U.S. Men's Clay Court Championships – Singles Wikipedia(Text) CC BY-SA