# 1989 Suntory Japan Open Tennis Championships – Men's singles

John McEnroe was the defending champion but lost in the semifinals to Stefan Edberg.
Edberg won in the final 6–3, 2–6, 6–4 against Ivan Lendl.

## Seeds

The top eight seeds received a bye to the second round.
* Ivan Lendl (final)
* Stefan Edberg (champion)
* John McEnroe (semifinals)
* Yannick Noah (second round)
* Brad Gilbert (quarterfinals)
* Kevin Curren (second round)
* Andrés Gómez (second round)
* Mikael Pernfors (second round)
* Amos Mansdorf (third round)
* Dan Goldie (first round)
* Anders Järryd (third round)
* Jay Berger (first round)
* John Fitzgerald (second round)
* Wally Masur (third round)
* Robert Seguso (second round)
* Pat Cash (second 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 | Final | Final | Final | Final | Final |
| 1 | Ivan Lendl | 6 | 6 | | | | | |
| | Richard Matuszewski | 2 | 2 | | | | | |
| | Richard Matuszewski | 2 | 2 | 1 | Ivan Lendl | 3 | 6 | 4 |
| | | | | 2 | Stefan Edberg | 6 | 2 | 6 |
| 3 | John McEnroe | 4 | 3 | 2 | Stefan Edberg | 6 | 2 | 6 |
| 2 | Stefan Edberg | 6 | 6 | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 1 | I Lendl | 7 | 6 | | | | | | | | | |
| | P Chamberlin | 6 | 7 | 7 | | P Chamberlin | 6 | 3 | | | | | | | | | |
| SE | R Van't Hof | 7 | 6 | 5 | | | | | 1 | I Lendl | 6 | 6 | | | | | |
| | D Pate | 7 | 2 | 3 | | | | | Q | B Scanlon | 2 | 4 | | | | | |
| Q | B Scanlon | 6 | 6 | 6 | Q | B Scanlon | 2 | | | | | | | | | | |
| | G Connell | 6 | 6 | 5 | 16 | P Cash | 4$^r$ | | | | | | | | | | |
| 16 | P Cash | 4 | 7 | 7 | | | | | | | | | | 1 | I Lendl | 6 | 6 |
| 10 | D Goldie | 6 | 2 | 1 | | | | | | | | | | | N Pereira | 2 | 2 |
| | J Pugh | 3 | 6 | 6 | | J Pugh | 4 | 6 | | | | | | | | | |
| | M Davis | 3 | 6 | 4 | Q | G Van Emburgh | 6 | 7 | | | | | | | | | |
| Q | G Van Emburgh | 6 | 3 | 6 | | | | | Q | G Van Emburgh | 7 | 3 | 1 | | | | |
| | N Pereira | 7 | 7 | | | | | | | N Pereira | 5 | 6 | 6 | | | | |
| | R Fromberg | 6 | 6 | | | N Pereira | 6 | 6 | | | | | | | | | |
| | | | | | 7 | A Gómez | 4 | 1 | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 4 | Y Noah | 4 | 5 | | | | | | | | | |
| | J Rive | 2 | 4 | | | G Layendecker | 6 | 7 | | | | | | | | | |
| | G Layendecker | 6 | 6 | | | | | | | G Layendecker | 4 | 6 | 4 | | | | |
| | J Stoltenberg | 6 | 3 | 7 | | | | | | J Stoltenberg | 6 | 3 | 6 | | | | |
| Q | S Guy | 4 | 6 | 6 | | J Stoltenberg | 5 | 6 | 7 | | | | | | | | |
| Q | T Nydahl | 4 | 3 | | 13 | J Fitzgerald | 7 | 2 | 5 | | | | | | | | |
| 13 | J Fitzgerald | 6 | 6 | | | | | | | | | | | J Stoltenberg | 6 | 4 | 6 |
| 12 | J Berger | 4 | 6 | | | | | | | | | | | R Matuszewski | 4 | 6 | 7 |
| | B Dyke | 6 | 7 | | | B Dyke | 6 | 4 | 6 | | | | | | | | |
| | K Evernden | 6 | 6 | | | K Evernden | 4 | 6 | 7 | | | | | | | | |
| WC | S Shiraishi | 1 | 4 | | | | | | | K Evernden | 4 | 7 | 2 | | | | |
| | R Matuszewski | 6 | 6 | | | | | | | R Matuszewski | 6 | 6 | 6 | | | | |
| | T Svantesson | 4 | 3 | | | R Matuszewski | 7 | 1 | 7 | | | | | | | | |
| | | | | | 6 | K Curren | 6 | 6 | 6 | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 5 | B Gilbert | 6 | 6 | | | | | | | | | | |
| WC | T Tsuchihashi | 6 | 7 | | WC | T Tsuchihashi | 1 | 3 | | | | | | | | | | |
| | R Smith | 2 | 6 | | | | | | | 5 | B Gilbert | 6 | 6 | | | | | |
| Q | J Grabb | 7 | 4 | 6 | | | | | | 11 | A Järryd | 0 | 2 | | | | | |
| WC | T Fukui | 5 | 6 | 0 | Q | J Grabb | 4 | 6 | 3 | | | | | | | | | |
| WC | S Ota | 2 | 1 | | 11 | A Järryd | 6 | 2 | 6 | | | | | | | | | |
| 11 | A Järryd | 6 | 6 | | | | | | | | | | | 5 | B Gilbert | 6 | 4 | 1 |
| 14 | W Masur | 6 | 7 | | | | | | | | | | | 3 | J McEnroe | 2 | 6 | 6 |
| Q | A Castle | 3 | 6 | | 14 | W Masur | 6 | 4 | 6 | | | | | | | | | |
| | J-P Fleurian | 1 | 4 | | | R Krishnan | 2 | 6 | 3 | | | | | | | | | |
| | R Krishnan | 6 | 6 | | | | | | | 14 | W Masur | 2 | 0 | | | | | |
| | B Drewett | 7 | 3 | 7 | | | | | | 3 | J McEnroe | 6 | 6 | | | | | |
| | M Anger | 5 | 6 | 6 | | B Drewett | 2 | 2 | | | | | | | | | | |
| | | | | | 3 | J McEnroe | 6 | 6 | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | | | | | 8 | M Pernfors | 3 | 2 | | | | | | | | | |
| WC | H Nakano | 4 | 1 | | | S Davis | 6 | 6 | | | | | | | | | |
| | S Davis | 6 | 6 | | | | | | | S Davis | 6 | 7 | 6 | | | | |
| | O Rahnasto | 6 | 6 | 5 | | | | | 9 | A Mansdorf | 7 | 6 | 3 | | | | |
| | C Saceanu | 7 | 3 | 7 | | C Saceanu | 4 | 4 | | | | | | | | | |
| | J Carlsson | 2 | 6 | 3 | 9 | A Mansdorf | 6 | 6 | | | | | | | | | |
| 9 | A Mansdorf | 6 | 3 | 6 | | | | | | | | | | | S Davis | 4 | 2 |
| 15 | R Seguso | 3 | 7 | 6 | | | | | | | | | | 2 | S Edberg | 6 | 6 |
| Q | K Flach | 6 | 6 | 4 | 15 | R Seguso | 3 | 3 | | | | | | | | | |
| | G Michibata | 5 | 2 | | | M Šrejber | 6 | 6 | | | | | | | | | |
| | M Šrejber | 7 | 6 | | | | | | | M Šrejber | 4 | 4 | | | | | |
| | L Shiras | 6 | 3 | | | | | | 2 | S Edberg | 6 | 6 | | | | | |
| | Z Ali | 7 | 6 | | | Z Ali | 2 | 2 | | | | | | | | | |
| | | | | | 2 | S Edberg | 6 | 6 | | | | | | | | | |