# 1989 Singapore Open – Singles

Kelly Jones won in the final 6–1, 7–5 against Amos Mansdorf.

## Seeds

A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated.
* Kevin Curren (semifinals)
* Amos Mansdorf (final)
* John Fitzgerald (first round)
* Wally Masur (semifinals)
* Milan Šrejber (first round)
* Richard Matuszewski (first round)
* Jim Pugh (quarterfinals)
* Kelly Evernden (quarterfinals)

## 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
| 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 | Final | Final | Final | Final |
| 1 | K Curren | 6 | 6 | | | | | | | | | | | | | | | | | | | |
| | G Michibata | 1 | 1 | | 1 | K Curren | 6 | 6 | | | | | | | | | | | | | | |
| Q | Young Min-kwon | 6 | 3 | 4 | | J Carlsson | 3 | 3 | | | | | | | | | | | | | | |
| | J Carlsson | 4 | 6 | 6 | | | | | | 1 | K Curren | 6 | 6 | | | | | | | | | |
| | J Stoltenberg | 6 | 5 | 4 | | | | | | 7 | J Pugh | 4 | 2 | | | | | | | | | |
| | T Nydahl | 3 | 7 | 6 | | T Nydahl | 0 | 6 | | | | | | | | | | | | | | |
| | G Connell | 6 | 3 | | 7 | J Pugh | 6 | 7 | | | | | | | | | | | | | | |
| 7 | J Pugh | 7 | 6 | | | | | | | | | | | | 1 | K Curren | | | | | | |
| 3 | J Fitzgerald | 6 | 1 | | | | | | | | | | | | Q | K Jones | w/o | | | | | |
| | R Fromberg | 7 | 6 | | | R Fromberg | 7 | 3 | 6 | | | | | | | | | | | | | |
| | J Grabb | 6 | 6 | | | J Grabb | 6 | 6 | 7 | | | | | | | | | | | | | |
| | J Rive | 3 | 3 | | | | | | | | J Grabb | 4 | 6 | 5 | | | | | | | | |
| | M Anger | 4 | 6 | 2 | | | | | | Q | K Jones | 6 | 2 | 7 | | | | | | | | |
| Q | K Jones | 6 | 4 | 6 | Q | K Jones | 6 | 6 | | | | | | | | | | | | | | |
| WC | R Leach | 6 | 6 | | WC | R Leach | 3 | 2 | | | | | | | | | | | | | | |
| 6 | R Matuszewski | 2 | 2 | | | | | | | | | | | | | | | | Q | Kelly Jones | 6 | 7 |
| 5 | M Šrejber | 4 | 6 | 3 | | | | | | | | | | | | | | | 2 | Amos Mansdorf | 1 | 5 |
| | O Rahnasto | 6 | 2 | 6 | | O Rahnasto | 3 | 6 | 3 | | | | | | | | | | | | | |
| | V Amritraj | 0 | 6 | | | P Chamberlin | 6 | 2 | 6 | | | | | | | | | | | | | |
| | P Chamberlin | 6 | 7 | | | | | | | | P Chamberlin | 3 | 4 | | | | | | | | | |
| | G Pozzi | 6 | 6 | 6 | | | | | | 4 | W Masur | 6 | 6 | | | | | | | | | |
| | P Wekesa | 3 | 7 | 2 | | G Pozzi | 4 | 2 | | | | | | | | | | | | | | |
| | G Layendecker | 6 | 1 | | 4 | W Masur | 6 | 6 | | | | | | | | | | | | | | |
| 4 | W Masur | 7 | 6 | | | | | | | | | | | | 4 | W Masur | 6 | 6 | | | | |
| 8 | K Evernden | 7 | 6 | | | | | | | | | | | | 2 | A Mansdorf | 7 | 7 | | | | |
| | Z Ali | 6 | 4 | | 8 | K Evernden | 6 | 6 | | | | | | | | | | | | | | |
| | C Saceanu | 6 | 6 | | | C Saceanu | 4 | 2 | | | | | | | | | | | | | | |
| Q | L Scott | 2 | 4 | | | | | | | 8 | K Evernden | 6 | 1 | | | | | | | | | |
| | D Pate | 6 | 2 | | | | | | | 2 | A Mansdorf | 7 | 6 | | | | | | | | | |
| | T Svantesson | 7 | 6 | | | T Svantesson | 1 | 2 | | | | | | | | | | | | | | |
| Q | M Christensen | 3 | 6 | 2 | 2 | A Mansdorf | 6 | 6 | | | | | | | | | | | | | | |
| 2 | A Mansdorf | 6 | 4 | 6 | | | | | | | | | | | | | | | | | | |