# 1991 Yugoslav Open – Singles

Goran Prpić was the defending champion, but did not compete this year.
Dimitri Poliakov won the title by defeating Javier Sanchez 6–4, 6–4 in the final.

## Seeds

* Richey Reneberg (quarterfinals)
* Derrick Rostagno (first round)
* David Wheaton (first round)
* Gilad Bloom (first round)
* Francisco Clavet (quarterfinals)
* Javier Sanchez (final)
* Carl-Uwe Steeb (second round)
* Thierry Champion (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

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| | Petr Korda | 6 | 6$^6$ | 5 | | | | |
| 6 | Javier Sanchez | 0 | 7$^8$ | 7 | | | | |
| 6 | Javier Sanchez | 0 | 7$^8$ | 7 | 6 | Javier Sanchez | 4 | 4 |
| | | | | | Q | Dimitri Poliakov | 6 | 6 |
| Q | Dimitri Poliakov | 4 | 6 | 6 | Q | Dimitri Poliakov | 6 | 6 |
| | Jean-Philippe Fleurian | 6 | 4 | 2 | | | | |

### 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 | R Reneberg | 2 | 6 | 6 | | | | | | | | | | | | | | |
| Q | A Medvedev | 6 | 2 | 3 | 1 | R Reneberg | 5 | 6 | 6 | | | | | | | | | |
| Q | M Stringari | 6 | 6 | | Q | M Stringari | 6 | 2 | 2 | | | | | | | | | |
| WC | E Rasberger | 3 | 4 | | | | | | | 1 | R Reneberg | 5 | 4 | | | | | |
| WC | F Cancellotti | 6 | 3 | 4 | | | | | | | P Korda | 7 | 6 | | | | | |
| | N Marques | 3 | 6 | 6 | | N Marques | 2 | 1 | | | | | | | | | | |
| | P Korda | 6 | 3 | 6 | | P Korda | 6 | 6 | | | | | | | | | | |
| 8 | T Champion | 4 | 6 | 3 | | | | | | | | | | | P Korda | 6 | 6$^6$ | 5 |
| 3 | D Wheaton | 4 | 3 | | | | | | | | | | | 6 | J Sanchez | 0 | 7$^8$ | 7 |
| | J Oncins | 6 | 6 | | | J Oncins | 4 | 6 | 3 | | | | | | | | | |
| Q | A Merinov | 2 | 2 | | WC | B Orešar | 6 | 4 | 6 | | | | | | | | | |
| WC | B Orešar | 6 | 6 | | | | | | | WC | B Orešar | 2 | 6$^2$ | | | | | |
| | A Rahunen | 6 | 3 | 2 | | | | | | 6 | J Sanchez | 6 | 7$^7$ | | | | | |
| | T Benhabiles | 1 | 6 | 6 | | T Benhabiles | 0 | 3 | | | | | | | | | | |
| | J Cunha-Silva | 2 | 6 | 2 | 6 | J Sanchez | 6 | 6 | | | | | | | | | | |
| 6 | J Sanchez | 6 | 4 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | F Clavet | 3 | 6 | 6 | | | | | | | | | | | | | | | |
| | G Raoux | 6 | 1 | 4 | 5 | F Clavet | 6 | 7$^7$ | | | | | | | | | | | |
| | L Jönsson | 4 | 5 | | | J Eltingh | 2 | 6$^5$ | | | | | | | | | | | |
| | J Eltingh | 6 | 7 | | | | | | | 5 | F Clavet | 6$^3$ | 6 | 2 | | | | | |
| | R Azar | 3 | 6$^6$ | | | | | | | Q | D. Poliakov | 7$^7$ | 2 | 6 | | | | | |
| Q | D. Poliakov | 6 | 7$^8$ | | Q | D. Poliakov | 6 | 6$^3$ | 6 | | | | | | | | | | |
| | J Gunnarsson | 7$^7$ | 3 | 7 | | J Gunnarsson | 0 | 7$^7$ | 2 | | | | | | | | | | |
| 4 | G Bloom | 6$^2$ | 6 | 5 | | | | | | | | | | | Q | D. Poliakov | 4 | 6 | 6 |
| 7 | CU Steeb | 6 | 7 | | | | | | | | | | | | | JF Fleurian | 6 | 4 | 2 |
| | M Sinner | 1 | 5 | | 7 | CU Steeb | 6 | 3 | 2 | | | | | | | | | | |
| | C Saceanu | 6 | 4 | 4 | | M Vajda | 3 | 6 | 6 | | | | | | | | | | |
| | M Vajda | 4 | 6 | 6 | | | | | | | M Vajda | 3 | 2 | | | | | | |
| LL | JA Fernandez | 2 | 5 | | | | | | | | JF Fleurian | 6 | 6 | | | | | | |
| | JF Fleurian | 6 | 7 | | | JF Fleurian | 6 | 6 | | | | | | | | | | | |
| | R Gilbert | 6 | 6 | | | R Gilbert | 3 | 2 | | | | | | | | | | | |
| 2 | D Rostagno | 0 | 4 | | | | | | | | | | | | | | | | |