# 1991 Muratti Time Indoor – Singles

Ivan Lendl was the defending champion, but lost in the second round to Cristiano Caratti.
Alexander Volkov won the title by defeating Caratti 6–1, 7–5 in the final.

## Seeds

* Ivan Lendl (second round)
* Goran Ivanišević (first round)
* Andrei Chesnokov (second round)
* Michael Chang (first rounf)
* Jakob Hlasek (semifinals)
* Aaron Krickstein (quarterfinals)
* Marc Rosset (first round)
* Alexander Volkov (champion)

## 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

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| WC | Cristiano Caratti | 7$^8$ | 6$^5$ | 6 | | | | |
| | Carl-Uwe Steeb | 6$^6$ | 7$^7$ | 3 | | | | |
| | Carl-Uwe Steeb | 6$^6$ | 7$^7$ | 3 | WC | Cristiano Caratti | 1 | 5 |
| | | | | | 8 | Alexander Volkov | 6 | 7 |
| 5 | Jakob Hlasek | 4 | 3 | | 8 | Alexander Volkov | 6 | 7 |
| 8 | Alexander Volkov | 6 | 6 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | I Lendl | 7 | 4 | 7 | | | | | | | | | | | | | | |
| | M Larsson | 5 | 6 | 5 | 1 | I Lendl | 4 | 6 | 6$^3$ | | | | | | | | | |
| WC | C Caratti | 7$^7$ | 6 | | WC | C Caratti | 6 | 1 | 7$^7$ | | | | | | | | | |
| | P Lundgren | 6$^4$ | 2 | | | | | | | WC | C Caratti | 6 | 6 | | | | | |
| WC | D Nargiso | 7 | 6 | | | | | | | | N Kulti | 3 | 1 | | | | | |
| | O Camporese | 5 | 4 | | WC | D Nargiso | 6$^4$ | 1 | | | | | | | | | | |
| | N Kulti | 6 | 6 | | | N Kulti | 7$^7$ | 6 | | | | | | | | | | |
| 7 | M Rosset | 3 | 4 | | | | | | | | | | | WC | C Caratti | 7$^8$ | 6$^5$ | 6 |
| 4 | M Chang | 1 | 5 | | | | | | | | | | | | CU Steeb | 6$^6$ | 7$^7$ | 3 |
| | CU Steeb | 6 | 7 | | | CU Steeb | 4 | 7$^7$ | 6 | | | | | | | | | |
| | K Nováček | 6 | 6 | | | K Nováček | 6 | 6$^1$ | 4 | | | | | | | | | |
| | R Agénor | 4 | 2 | | | | | | | | CU Steeb | 6 | 7$^7$ | | | | | |
| | T Champion | 6 | 7$^7$ | | | | | | | 6 | A Krickstein | 3 | 6$^4$ | | | | | |
| | M Koevermans | 4 | 6$^3$ | | | T Champion | 0$^r$ | | | | | | | | | | | |
| | A Mansdorf | 0 | 1 | | 6 | A Krickstein | 4 | | | | | | | | | | | |
| 6 | A Krickstein | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | J Hlasek | 7$^7$ | 6 | | | | | | | | | | | | | | |
| | T Witsken | 6$^2$ | 2 | | 5 | J Hlasek | 6 | 0 | 6 | | | | | | | | |
| Q | Roberto Raffa | 0 | 1 | | | A Järryd | 3 | 6 | 4 | | | | | | | | |
| | A Järryd | 6 | 6 | | | | | | | 5 | J Hlasek | 6 | 7$^7$ | | | | |
| LL | J Gunnarsson | 6 | 6 | | | | | | | LL | J Gunnarsson | 0 | 6$^5$ | | | | |
| Q | C Mezzadri | 3 | 3 | | LL | J Gunnarsson | 6 | 6 | | | | | | | | | |
| Q | S Soresini | 3 | 3 | | 3 | A Chesnokov | 4 | 3 | | | | | | | | | |
| 3 | A Chesnokov | 6 | 6 | | | | | | | | | | | 5 | J Hlasek | 4 | 3 |
| 8 | A Volkov | 6 | 6$^4$ | 6 | | | | | | | | | | 8 | A Volkov | 6 | 6 |
| Q | C Pioline | 4 | 7$^7$ | 4 | 8 | A Volkov | 6 | 3 | 7$^7$ | | | | | | | | |
| | C van Rensburg | 4 | 2 | | | E Jelen | 3 | 6 | 6$^2$ | | | | | | | | |
| | E Jelen | 6 | 6 | | | | | | | 8 | A Volkov | 6 | 6 | | | | |
| | A Cherkasov | 5 | 6 | 6$^4$ | | | | | | WC | P Cash | 4 | 4 | | | | |
| WC | P Cash | 7 | 4 | 7$^7$ | WC | P Cash | 7 | 6 | | | | | | | | | |
| | G Prpić | 6 | 3 | 6 | | G Prpić | 5 | 3 | | | | | | | | | |
| 2 | G Ivanišević | 3 | 6 | 4 | | | | | | | | | | | | | |