| Singles | |
|---|---|
| 1989 Seoul Open | |
| Champion |  Robert Van't Hof |
| Runner-up |  Brad Drewett |
| Final score | 7–5, 6–4 |
| Draw | 32 |
| Seeds | 8 |
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. [1]
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)| Semifinals | Final | ||||||||||||
| 1 | John Fitzgerald | 2 | 2 | ||||||||||
| 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 | |||||||||
| 2 | Kelly Evernden | 7 | 6 | 3 | |||||||||
| First round | Second round | Quarterfinals | 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 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | 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 | ||||||||||||||||||||||||
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