# 1991 Thriftway ATP Championships – Singles

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.
* Boris Becker (semifinals)
* Stefan Edberg (quarterfinals)
* Ivan Lendl (third round)
* Jim Courier (semifinals)
* Andre Agassi (third round)
* Guy Forget (champion)
* Pete Sampras (final)
* David Wheaton (third round)
* Emilio Sánchez (first round)
* Andrei Cherkasov (quarterfinals)
* Jakob Hlasek (second round)
* Brad Gilbert (quarterfinals)
* Michael Chang (third round)
* Derrick Rostagno (quarterfinals)
* Richey Reneberg (first round)
* Jonas Svensson (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1/WC | Boris Becker | 7$^9$ | 6 | | | | | | | | | | |
| 10 | Andrei Cherkasov | 6$^7$ | 3 | | | | | | | | | | |
| 10 | Andrei Cherkasov | 6$^7$ | 3 | 1/WC | Boris Becker | 6$^1$ | 6 | 3 | | | | | |
| | | | | 6 | Guy Forget | 7$^7$ | 4 | 6 | | | | | |
| 14 | Derrick Rostagno | 6$^6$ | 4 | 6 | Guy Forget | 7$^7$ | 4 | 6 | | | | | |
| 6 | Guy Forget | 7$^8$ | 6 | | | | | | | | | | |
| 6 | Guy Forget | 7$^8$ | 6 | | | | | | 6 | Guy Forget | 2 | 7$^7$ | 6 |
| | | | | | | | | | 7 | Pete Sampras | 6 | 6$^4$ | 4 |
| 12 | Brad Gilbert | 3 | 3 | | | | | | | | | | | 7 | Pete Sampras | 6 | 6$^4$ | 4 |
| 4 | Jim Courier | 6 | 6 | | | | | | | | | | |
| 4 | Jim Courier | 6 | 6 | 4 | Jim Courier | 2 | 5 | | | | | | |
| | | | | 7 | Pete Sampras | 6 | 7 | | | | | | |
| 7 | Pete Sampras | 6 | 6 | 7 | Pete Sampras | 6 | 7 | | | | | | |
| 2 | Stefan Edberg | 3 | 3 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1/WC | B Becker | 6 | 6 | | | | | | | | |
| | J-P Fleurian | 7 | 4 | 6 | | J-P Fleurian | 3 | 3 | | | | | | | | |
| | J Grabb | 5 | 6 | 3 | | | | | 1/WC | B Becker | 6 | 6 | | | | |
| | R Fromberg | 3 | 4 | | | | | | | M Washington | 4 | 4 | | | | |
| | M Washington | 6 | 6 | | | M Washington | 6 | 6 | | | | | | | | |
| | A Krickstein | 7$^7$ | 3 | 7$^7$ | | A Krickstein | 1 | 4 | | | | | | | | |
| 15 | R Reneberg | 6$^5$ | 6 | 6$^4$ | | | | | | | | | 1/WC | B Becker | 7$^9$ | 6 |
| 10 | A Cherkasov | 7$^7$ | 6 | | | | | | | | | | 10 | A Cherkasov | 6$^7$ | 3 |
| | T Woodbridge | 6$^4$ | 1 | | 10 | A Cherkasov | 6 | 6 | | | | | | | | |
| | P Lundgren | 7$^8$ | 4 | 6 | | P Lundgren | 4 | 2 | | | | | | | | |
| | A Chesnokov | 6$^6$ | 6 | 3 | | | | | 10 | A Cherkasov | 6 | 6 | | | | |
| WC | A Gómez | 5 | 6 | 7$^7$ | | | | | 8 | D Wheaton | 3 | 2 | | | | |
| | S Pescosolido | 7 | 4 | 6$^0$ | WC | A Gómez | 5 | 2 | | | | | | | | |
| | | | | | 8 | D Wheaton | 7 | 6 | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | 3/WC | I Lendl | 6 | 6 | | | | | | | | | | |
| | P McEnroe | 6 | 7 | | P McEnroe | 1 | 3 | | | | | | | | | | |
| | K Curren | 3 | 5 | | | | | | 3/WC | I Lendl | 6$^5$ | 6 | 3 | | | | |
| | C Caratti | 2 | 6$^2$ | | | | | | 14 | D Rostagno | 7$^7$ | 3 | 6 | | | | |
| Q | C Garner | 6 | 7$^7$ | Q | C Garner | 6 | 3 | 4 | | | | | | | | | |
| | G Bloom | 2 | 3 | 14 | D Rostagno | 4 | 6 | 6 | | | | | | | | | |
| 14 | D Rostagno | 6 | 6 | | | | | | | | | | | 14 | D Rostagno | 6$^6$ | 4 |
| 11 | J Hlasek | 6 | 6 | | | | | | | | | | | 6 | G Forget | 7$^8$ | 6 |
| | J Arias | 1 | 1 | 11 | J Hlasek | 4 | 5 | | | | | | | | | | |
| Q | G Pozzi | 6 | 6 | Q | G Pozzi | 6 | 7 | | | | | | | | | | |
| | T Witsken | 4 | 2 | | | | | | Q | G Pozzi | 4 | 4 | | | | | |
| Q | M Ondruska | 6 | 6 | | | | | | 6 | G Forget | 6 | 6 | | | | | |
| | M Woodforde | 3 | 3 | Q | M Ondruska | 2 | 2 | | | | | | | | | | |
| | | | | 6 | G Forget | 6 | 6 | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | A Agassi | 7 | 2 | 6 | | | | | | | | | |
| | P Korda | 6 | 6 | | | P Korda | 5 | 6 | 2 | | | | | | | | | |
| | G Connell | 3 | 1 | | | | | | | 5 | A Agassi | 6$^7$ | 7$^8$ | 4 | | | | |
| Q | F Roese | 3 | 1 | | | | | | | 12 | B Gilbert | 7$^9$ | 6$^6$ | 6 | | | | |
| | J Yzaga | 6 | 6 | | | J Yzaga | 2 | 5 | | | | | | | | | | |
| | B Pearce | 5 | 3 | | 12 | B Gilbert | 6 | 7 | | | | | | | | | | |
| 12 | B Gilbert | 7 | 6 | | | | | | | | | | | | 12 | B Gilbert | 3 | 3 |
| 13 | M Chang | 4 | 6 | 6 | | | | | | | | | | | 4 | J Courier | 6 | 6 |
| | R Gilbert | 6 | 2 | 1 | 13 | M Chang | 6 | 6 | | | | | | | | | | |
| Q | D Visser | 6 | 3 | 7$^7$ | Q | D Visser | 1 | 3 | | | | | | | | | | |
| | R Agénor | 4 | 6 | 6$^2$ | | | | | | 13 | M Chang | 5 | 2 | | | | | |
| | D Pate | 3 | 5 | | | | | | | 4 | J Courier | 7 | 6 | | | | | |
| | M Pernfors | 6 | 7 | | | M Pernfors | 3 | 1 | | | | | | | | | | |
| | | | | | 4 | J Courier | 6 | 6 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 7 | P Sampras | 7$^7$ | 6 | | | | | | | | | |
| | G Muller | 7$^7$ | 4 | 6$^4$ | | W Masur | 6$^3$ | 4 | | | | | | | | | |
| | W Masur | 6$^3$ | 6 | 7$^7$ | | | | | | 7 | P Sampras | 6 | 6 | | | | |
| | W Ferreira | 6 | 6 | | | | | | | | W Ferreira | 1 | 4 | | | | |
| | R Krishnan | 1 | 3 | | | W Ferreira | 6 | 3 | 6 | | | | | | | | |
| | J Stoltenberg | 6 | 6 | | | J Stoltenberg | 2 | 6 | 3 | | | | | | | | |
| 9 | E Sánchez | 3 | 4 | | | | | | | | | | | 7 | P Sampras | 6 | 6 |
| 16 | J Svensson | 7$^7$ | 5 | 4 | | | | | | | | | | 2 | S Edberg | 3 | 3 |
| | A Järryd | 6$^2$ | 7 | 6 | | A Järryd | 4 | 1 | | | | | | | | | |
| | A Mansdorf | 6 | 6 | | | A Mansdorf | 6 | 6 | | | | | | | | | |
| | S Davis | 4 | 4 | | | | | | | | A Mansdorf | 1 | 2 | | | | |
| Q | G Stafford | 6 | 6 | | | | | | | 2 | S Edberg | 6 | 6 | | | | |
| Q | S DeVries | 4 | 3 | | Q | G Stafford | 2 | 0 | | | | | | | | | |
| | | | | | 2 | S Edberg | 6 | 6 | | | | | | | | | |