# 1990 Toray Pan Pacific Open – Singles

Martina Navratilova was the defending champion, but did not compete this year.
Steffi Graf won the title by defeating Arantxa Sánchez Vicario 6–1, 6–2 in the final.

## Seeds

The first four seeds received a bye into the second round.
* Steffi Graf (champion)
* Arantxa Sánchez Vicario (final)
* Manuela Maleeva-Fragnière (semifinals)
* (n/a)
* Larisa Savchenko (quarterfinals)
* Gigi Fernández (quarterfinals)
* Lori McNeil (first round)
* Anne Minter (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 | Final | Final | Final | Final |
| 1 | Steffi Graf | 6 | 6 | | | | |
| 3 | Manuela Maleeva-Fragnière | 4 | 4 | | | | |
| 3 | Manuela Maleeva-Fragnière | 4 | 4 | 1 | Steffi Graf | 6 | 6 |
| | | | | 2 | Arantxa Sánchez Vicario | 1 | 2 |
| | Akiko Kijimuta | 4 | 2 | 2 | Arantxa Sánchez Vicario | 1 | 2 |
| 2 | Arantxa Sánchez Vicario | 6 | 6 | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | S Graf | 6 | 6 | | | | | | | | | |
| | C Benjamin | 3 | 3 | | | N Jagerman | 0 | 1 | | | | | | | | | |
| | N Jagerman | 6 | 6 | | | | | | | 1 | S Graf | 6 | 6 | | | | |
| | P Louie Harper | 2 | 6 | 6 | | | | | | 5 | L Savchenko | 0 | 3 | | | | |
| Q | S Collins | 6 | 4 | 2 | | P Louie Harper | 6 | 6 | 6 | | | | | | | | |
| | C Porwik | 4 | 4 | | 5 | L Savchenko | 4 | 7 | 7 | | | | | | | | |
| 5 | L Savchenko | 6 | 6 | | | | | | | | | | | 1 | S Graf | 6 | 6 |
| | | | | | | | | | | | | | | 3 | M Maleeva-Fragnière | 4 | 4 |
| | | | | | 3 | M Maleeva-Fragnière | 6 | 6 | | | | | | | | | |
| Q | A Nishiya | 5 | 1 | | | T Phelps | 2 | 1 | | | | | | | | | |
| | T Phelps | 7 | 6 | | | | | | | 3 | M Maleeva-Fragnière | 6 | 6 | | | | |
| | B Schultz | 6 | 7 | | | | | | | | B Schultz | 2 | 0 | | | | |
| | R McQuillan | 3 | 5 | | | B Schultz | 6 | 6 | | | | | | | | | |
| | E Inoue | 6 | 7 | | | E Inoue | 1 | 2 | | | | | | | | | |
| 8 | A Minter | 2 | 6 | | | | | | | | | | | | | | |

### Bottom 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 |
| 7 | L McNeil | 3 | 6 | 3 | | | | | | | | | | | | | | |
| | A Kijimuta | 6 | 3 | 6 | | A Kijimuta | 6 | 3 | 6 | | | | | | | | | |
| | C MacGregor | 6 | 6 | | | C MacGregor | 1 | 6 | 1 | | | | | | | | | |
| LL | H Ludloff | 4 | 4 | | | | | | | | A Kijimuta | 7 | 2 | 6 | | | | |
| | K Adams | 2 | 6 | 3 | | | | | | LL | N Miyagi | 6 | 6 | 2 | | | | |
| LL | N Miyagi | 6 | 3 | 6 | LL | N Miyagi | 7 | 6 | | | | | | | | | | |
| | | | | | | R Hiraki | 6 | 2 | | | | | | | | | | |
| | | | | | | | | | | | | | | | | A Kijimuta | 4 | 2 |
| 6 | G Fernández | 6 | 6 | | | | | | | | | | | | 2 | A Sánchez Vicario | 6 | 6 |
| | K Date | 1 | 4 | | 6 | G Fernández | 6 | 6 | | | | | | | | | | |
| | K Okamoto | 3 | 3 | | Q | M Kidowaki | 3 | 3 | | | | | | | | | | |
| Q | M Kidowaki | 6 | 6 | | | | | | | 6 | G Fernández | 6 | 1 | 2 | | | | |
| | JA Faull | 1 | 6 | | | | | | | 2 | A Sánchez Vicario | 1 | 6 | 6 | | | | |
| | E Smylie | 6 | 2 | r | | JA Faull | 1 | 0 | | | | | | | | | | |
| | | | | | 2 | A Sánchez Vicario | 6 | 6 | | | | | | | | | | |