Guy Forget defeated Pete Sampras in the final, 2–6, 7–6(7–4), 6–4 to win the singles tennis title at the 1991 Cincinnati Masters.
Stefan Edberg was the defending champion, but lost to Sampras in the quarterfinals.
Seeds The top eight seeds received a bye to the second round.
Draw
Finals
Top half
Section 1
Section 2
Bottom half
Section 3
Section 4
References
External links ATP main draw ITF tournament edition details