# 1990 OTB International Open – Men's singles

Simon Youl was the defending champion, but did not participate this year.
Ramesh Krishnan won the tournament, beating Kelly Evernden in the final, 6–1, 6–1.

## Seeds

The top four seeds received a bye into the second round.
* Martín Jaite (semifinals)
* Amos Mansdorf (quarterfinals)
* Jaime Yzaga (second round)
* Alberto Mancini (second round)
* Milan Šrejber (second round)
* Aki Rahunen (first round)
* Kelly Evernden (final)
* Derrick Rostagno (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 |
| 1 | Martín Jaite | 6 | 3 | 5 | | | | |
| | Ramesh Krishnan | 1 | 6 | 7 | | | | |
| | Ramesh Krishnan | 1 | 6 | 7 | | Ramesh Krishnan | 6 | 6 |
| | | | | | 7 | Kelly Evernden | 1 | 1 |
| | Brad Pearce | 2 | 6 | 4 | 7 | Kelly Evernden | 1 | 1 |
| 7 | Kelly Evernden | 6 | 3 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | M Jaite | 7 | 7 | | | | | | | | | | | |
| | J Anderson | 4 | 4 | | | F Santoro | 5 | 5 | | | | | | | | | | | |
| | F Santoro | 6 | 6 | | | | | | | 1 | M Jaite | 4 | 7 | 6 | | | | | |
| | T Benhabiles | 3 | 3 | | | | | | | Q | A Olhovskiy | 6 | 5 | 4 | | | | | |
| Q | A Olhovskiy | 6 | 6 | | Q | A Olhovskiy | 2 | 6 | 6 | | | | | | | | | | |
| | G Connell | 6 | | | | G Connell | 6 | 4 | 2 | | | | | | | | | | |
| 8 | D Rostagno | 4 | r | | | | | | | | | | | | 1 | M Jaite | 6 | 3 | 5 |
| | | | | | | | | | | | | | | | | R Krishnan | 1 | 6 | 7 |
| | | | | | 4 | A Mancini | 1 | 4 | | | | | | | | | | | |
| LL | M Briggs | 7 | 3 | 4 | WC | C Adams | 6 | 6 | | | | | | | | | | | |
| WC | C Adams | 5 | 6 | 6 | | | | | | WC | C Adams | 3 | 1 | | | | | | |
| | R Krishnan | 6 | 6 | | | | | | | | R Krishnan | 6 | 6 | | | | | | |
| WC | J Kodeš Jr. | 0 | 4 | | | R Krishnan | 6 | 4 | 6 | | | | | | | | | | |
| | T Champion | 7 | 3 | 6 | 5 | M Šrejber | 3 | 6 | 4 | | | | | | | | | | |
| 5 | M Šrejber | 5 | 6 | 7 | | | | | | | | | | | | | | | |

### 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 | Semifinals |
| 6 | A Rahunen | 4 | 4 | | | | | | | | | | | | | | | |
| Q | S Guy | 6 | 6 | | Q | S Guy | 5 | 6 | 6 | | | | | | | | | |
| Q | G Raoux | 1 | 4 | | | M Střelba | 7 | 4 | 4 | | | | | | | | | |
| | M Střelba | 6 | 6 | | | | | | | Q | S Guy | 5 | 6$^3$ | | | | | |
| | B Pearce | 6 | 7 | | | | | | | | B Pearce | 7 | 7$^7$ | | | | | |
| | T Högstedt | 2 | 5 | | | B Pearce | 6 | 6 | | | | | | | | | | |
| | | | | | 3 | J Yzaga | 3 | 3 | | | | | | | | | | |
| | | | | | | | | | | | | | | | B Pearce | 2 | 6 | 4 |
| 7 | K Evernden | 6 | 4 | 6 | | | | | | | | | | 7 | K Evernden | 6 | 3 | 6 |
| Q | D Goldberg | 4 | 6 | 2 | 7 | K Evernden | 5 | 7 | 7 | | | | | | | | | |
| WC | D Montes de Oca | 2 | 5 | | | J Bates | 7 | 6 | 6 | | | | | | | | | |
| | J Bates | 6 | 7 | | | | | | | 7 | K Evernden | 7 | 7$^7$ | | | | | |
| | M Woodforde | 6 | 7 | | | | | | | 2 | A Mansdorf | 5 | 6$^5$ | | | | | |
| | P Kühnen | 1 | 6 | | | M Woodforde | 6 | 3 | | | | | | | | | | |
| | | | | | 2 | A Mansdorf | 7 | 6 | | | | | | | | | | |