# 1989 OTB Open – Men's singles

Tim Mayotte was the defending champion, but did not participate this year.
Simon Youl won the tournament, beating Scott Davis in the final, 2–6, 6–4, 6–4.

## Seeds

* Dan Goldie (semifinals)
* Richard Matuszewski (first round)
* Ramesh Krishnan (quarterfinals)
* Scott Davis (final)
* John Frawley (first round)
* Martin Laurendeau (second round)
* Jeff Tarango (quarterfinals)
* Glenn Michibata (semifinals)

## 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 | Final |
| 1 | Dan Goldie | 6 | 4 | 1 | | | | | |
| 4 | Scott Davis | 3 | 6 | 6 | | | | | |
| 4 | Scott Davis | 3 | 6 | 6 | 4 | Scott Davis | 6 | 4 | 4 |
| | | | | | | Simon Youl | 2 | 6 | 6 |
| | Simon Youl | 3 | 7 | 7 | | Simon Youl | 2 | 6 | 6 |
| 8 | Glenn Michibata | 6 | 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 | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | D Goldie | 6 | 6 | | | | | | | | | | | | | | | | |
| | B Dyke | 3 | 3 | | 1 | D Goldie | 6 | 6 | | | | | | | | | | | |
| | M Nido | 3 | 7 | 7 | | M Nido | 2 | 4 | | | | | | | | | | | |
| | P Johnson | 6 | 6 | 6 | | | | | | 1 | D Goldie | 1 | 7 | 6 | | | | | |
| | N Caswell | 5 | 2 | | | | | | | 7 | J Tarango | 6 | 6 | 2 | | | | | |
| | V Amritraj | 7 | 6 | | | V Amritraj | 3 | 3 | | | | | | | | | | | |
| Q | G Connell | 3 | 4 | | 7 | J Tarango | 6 | 6 | | | | | | | | | | | |
| 7 | J Tarango | 6 | 6 | | | | | | | | | | | | 1 | D Goldie | 6 | 4 | 1 |
| 4 | S Davis | 6 | 7 | 6 | | | | | | | | | | | 4 | S Davis | 3 | 6 | 6 |
| Q | J Boytim | 7 | 6 | 2 | 4 | S Davis | 7 | 6 | | | | | | | | | | | |
| | M Allen | 2 | 4 | | | N Broad | 5 | 1 | | | | | | | | | | | |
| | N Broad | 6 | 6 | | | | | | | 4 | S Davis | 7 | 6 | | | | | | |
| | M Robertson | 6 | 3 | 7 | | | | | | | S Warner | 5 | 1 | | | | | | |
| WC | C Garner | 1 | 6 | 6 | | M Robertson | 7 | 6 | 5 | | | | | | | | | | |
| | S Warner | 6 | 6 | | | S Warner | 6 | 7 | 7 | | | | | | | | | | |
| 5 | J Frawley | 3 | 4 | | | | | | | | | | | | | | | | |

### 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 |
| 6 | M Laurendeau | 6 | 6 | | | | | | | | | | | | | | | | |
| WC | T Ho | 1 | 4 | | 6 | M Laurendeau | 4 | 0 | | | | | | | | | | | |
| | S Youl | 6 | 4 | 7 | | S Youl | 6 | 6 | | | | | | | | | | | |
| | R Fromberg | 2 | 6 | 5 | | | | | | | S Youl | 6 | 3 | 7 | | | | | |
| | JC Báguena | 2 | 4 | | | | | | | 3 | R Krishnan | 3 | 6 | 5 | | | | | |
| | D Burke | 6 | 6 | | | D Burke | 3 | 2 | | | | | | | | | | | |
| Q | B Pearce | 3 | 3 | | 3 | R Krishnan | 6 | 6 | | | | | | | | | | | |
| 3 | R Krishnan | 6 | 6 | | | | | | | | | | | | | S Youl | 3 | 7 | 7 |
| 8 | G Michibata | 6 | 6 | 6 | | | | | | | | | | | 8 | G Michibata | 6 | 6 | 6 |
| | B Moir | 4 | 7 | 4 | 8 | G Michibata | 6 | 6 | | | | | | | | | | | |
| | K Kinnear | 6 | 4 | 4 | | N Odizor | 2 | 3 | | | | | | | | | | | |
| | N Odizor | 4 | 6 | 6 | | | | | | 8 | G Michibata | 7 | 6 | | | | | | |
| Q | V Jansson | 4 | 4 | | | | | | | | C Pridham | 6 | 4 | | | | | | |
| | C Pridham | 6 | 6 | | | C Pridham | 3 | 6 | 6 | | | | | | | | | | |
| | O Rahnasto | 6 | 2 | 6 | | O Rahnasto | 6 | 1 | 2 | | | | | | | | | | |
| 2 | R Matuszewski | 3 | 6 | 4 | | | | | | | | | | | | | | | |