# 1989 Seoul Open – Singles

Dan Goldie was the defending champion but did not compete that year.
Robert Van't Hof won in the final 7–5, 6–4 against Brad Drewett.

## Seeds

* John Fitzgerald (semifinals)
* Kelly Evernden (semifinals)
* Scott Davis (first round)
* Olli Rahnasto (first round)
* Glenn Layendecker (first round)
* Brad Drewett (final)
* Paul Chamberlin (quarterfinals)
* Christian Saceanu (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 | John Fitzgerald | 2 | 2 | | | | | |
| Q | Robert Van't Hof | 6 | 6 | | | | | |
| Q | Robert Van't Hof | 6 | 6 | | Q | Robert Van't Hof | 7 | 6 |
| | | | | | 6 | Brad Drewett | 5 | 4 |
| 6 | Brad Drewett | 6 | 7 | 6 | 6 | Brad Drewett | 5 | 4 |
| 2 | Kelly Evernden | 7 | 6 | 3 | | | | |

### 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 |
| 1 | J Fitzgerald | 7 | 6 | | | | | | | | | | | | | | | |
| | J Goodall | 6 | 0 | | 1 | J Fitzgerald | 7 | 7 | | | | | | | | | | |
| WC | J-S Yoo | 2 | 6 | 7 | WC | J-S Yoo | 6 | 5 | | | | | | | | | | |
| | B Dyke | 6 | 1 | 6 | | | | | | 1 | J Fitzgerald | 6 | 3 | 6 | | | | |
| | T Svantesson | 4 | 6 | 2 | | | | | | | J-P Fleurian | 2 | 6 | 3 | | | | |
| | J-P Fleurian | 6 | 3 | 6 | | J-P Fleurian | 6 | 7 | | | | | | | | | | |
| | M Anger | 7 | 7 | | | M Anger | 3 | 5 | | | | | | | | | | |
| 8 | C Saceanu | 6 | 6 | | | | | | | | | | | | 1 | J Fitzgerald | 2 | 2 |
| 3 | S Davis | 4 | 4 | | | | | | | | | | | | Q | R Van't Hof | 6 | 6 |
| | T Nydahl | 6 | 6 | | | T Nydahl | 7 | 6 | 6 | | | | | | | | | |
| | A Castle | 3 | 6 | 6 | Q | R Van't Hof | 5 | 7 | 7 | | | | | | | | | |
| Q | R Van't Hof | 6 | 4 | 7 | | | | | | Q | R Van't Hof | 6 | 6 | | | | | |
| WC | B-S Kim | 7 | 7 | | | | | | | WC | B-S Kim | 3 | 4 | | | | | |
| | P Wekesa | 6 | 5 | | WC | B-S Kim | 6 | 6 | 6 | | | | | | | | | |
| | L Shiras | 7 | 3 | 6 | | L Shiras | 4 | 7 | 1 | | | | | | | | | |
| 5 | G Layendecker | 6 | 6 | 1 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | B Drewett | 7 | 6 | | | | | | | | | | | | | | |
| Q | L Scott | 5 | 4 | 6 | B Drewett | 6 | 6 | | | | | | | | | | |
| | J Carlsson | 3 | 2 | | S Guy | 4 | 4 | | | | | | | | | | |
| | S Guy | 6 | 6 | | | | | 6 | B Drewett | 6 | 7 | 7 | | | | | |
| | V Amritraj | 6 | 6 | | | | | | V Amritraj | 7 | 5 | 6 | | | | | |
| | G Pozzi | 3 | 3 | | V Amritraj | 6 | 6 | | | | | | | | | | |
| | N Pereira | 6 | 6 | | N Pereira | 3 | 2 | | | | | | | | | | |
| 4 | O Rahnasto | 3 | 4 | | | | | | | | | | 6 | B Drewett | 6 | 7 | 6 |
| 7 | P Chamberlin | 7 | 6 | | | | | | | | | | 2 | K Evernden | 7 | 6 | 3 |
| | Y Doumbia | 5 | 2 | 7 | P Chamberlin | 6 | 7 | | | | | | | | | | |
| | M Kratzmann | 6 | 6 | | M Kratzmann | 1 | 5 | | | | | | | | | | |
| Q | Yoong M-k | 1 | 2 | | | | | 7 | P Chamberlin | 6 | 6 | 5 | | | | | |
| Q | J Bates | 2 | 2 | | | | | 2 | K Evernden | 4 | 7 | 7 | | | | | |
| | J Canter | 6 | 6 | | J Canter | 3 | 2 | | | | | | | | | | |
| WC | Roh G-t | 3 | 4 | 2 | K Evernden | 6 | 6 | | | | | | | | | | |
| 2 | K Evernden | 6 | 6 | | | | | | | | | | | | | | |