| Singles | |
|---|---|
| 1990 KAL Cup Korea Open | |
| Champion |  Alex Antonitsch |
| Runner-up |  Pat Cash |
| Final score | 7–6, 6–3 |
| Draw | 32 |
| Seeds | 8 |
Robert Van't Hof was the defending champion, but did not participate this year.
Alex Antonitsch won the tournament, beating Pat Cash in the final, 7–6, 6–3.
Wally Masur (second round)
Amos Mansdorf (first round)
Paul Chamberlin (first round)
Kelly Evernden (second round)
Milan Šrejber (quarterfinals) Dan Goldie (semifinals)
Thomas Högstedt (first round) Gilad Bloom (semifinals)| Semifinals | Final | ||||||||||||
| 8 | Gilad Bloom | 3 | 3 | ||||||||||
| Q | Pat Cash | 6 | 6 | ||||||||||
| Q | Pat Cash | 6 | 3 | ||||||||||
| Alex Antonitsch | 7 | 6 | |||||||||||
| 6 | Dan Goldie | 6 | 3 | 6 | |||||||||
| Alex Antonitsch | 4 | 6 | 7 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | W Masur | 6 | 6 | ||||||||||||||||||||||||
 C Saceanu | 2 | 2 | 1 | W Masur | 7 | 6 | 4 | ||||||||||||||||||||
| R Matuszewski | 6 | 6 | 6 | R Matuszewski | 6 | 7 | 6 | ||||||||||||||||||||
| J Stoltenberg | 2 | 7 | 2 | R Matuszewski | 2 | 2 | |||||||||||||||||||||
 M Nido | 6 | 1 | 8 | G Bloom | 6 | 6 | |||||||||||||||||||||
 S Živojinović | 0 | 0r | M Nido | 4 | 3 | ||||||||||||||||||||||
| S Youl | 3 | 1 | 8 | G Bloom | 6 | 6 | |||||||||||||||||||||
| 8 | G Bloom | 6 | 6 | 8 | G Bloom | 3 | 3 | ||||||||||||||||||||
| 3 | P Chamberlin | 5 | 2 | Q | P Cash | 6 | 6 | ||||||||||||||||||||
 G Connell | 7 | 6 | G Connell | 7 | 5 | 2 | |||||||||||||||||||||
| M Laurendeau | 4 | 3 | Q | P Cash | 6 | 7 | 6 | ||||||||||||||||||||
| Q | P Cash | 6 | 6 | Q | P Cash | 6 | 6 | ||||||||||||||||||||
| Q |  N Brown | 4 | 3 | 5 | M Šrejber | 2 | 3 | ||||||||||||||||||||
| Q | J Carlsson | 6 | 6 | Q | J Carlsson | 0 | 4 | ||||||||||||||||||||
 T Nijssen | 3 | 1 | 5 | M Šrejber | 6 | 6 | |||||||||||||||||||||
| 5 | M Šrejber | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | D Goldie | 6 | 2 | 6 | |||||||||||||||||||||||
| T Woodbridge | 4 | 6 | 4 | 6 | D Goldie | 4 | 6 | 6 | |||||||||||||||||||
| WC |  J-s Kim | 5 | 4 | J Rive | 6 | 3 | 4 | ||||||||||||||||||||
| J Rive | 7 | 6 | 6 | D Goldie | 7 | 6 | |||||||||||||||||||||
 N Pereira | 1 | 3 | Q |  S Matsuoka | 5 | 2 | |||||||||||||||||||||
| Q | S Matsuoka | 6 | 6 | Q | S Matsuoka | 6 | 6 | ||||||||||||||||||||
| WC | J-h Lee | 3 | 1 | 4 | K Evernden | 3 | 1 | ||||||||||||||||||||
| 4 | K Evernden | 6 | 6 | 6 | D Goldie | 6 | 3 | 6 | |||||||||||||||||||
| 7 | T Högstedt | 5 | 6 | 4 | A Antonitsch | 4 | 6 | 7 | |||||||||||||||||||
| L Shiras | 7 | 4 | 6 | L Shiras | 1 | 0 | |||||||||||||||||||||
| A Antonitsch | 6 | 6 | A Antonitsch | 6 | 6 | ||||||||||||||||||||||
| K Jones | 4 | 4 | A Antonitsch | 6 | 6 | ||||||||||||||||||||||
| WC | B-S Kim | 5 | 6 | 6 | P Kühnen | 4 | 4 | ||||||||||||||||||||
| P Kühnen | 7 | 2 | 7 | P Kühnen | 6 | 6 | |||||||||||||||||||||
| L-A Wahlgren | 6 | 7 | L-A Wahlgren | 0 | 1 | ||||||||||||||||||||||
| 2 | A Mansdorf | 4 | 5 | ||||||||||||||||||||||||
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