| Women's singles | |
|---|---|
| 2001 AIG Japan Open Tennis Championships | |
| Champion |  Monica Seles |
| Runner-up |  Tamarine Tanasugarn |
| Score | 6–3, 6–2 |
| Draw | 30 (4 Q / 2 WC ) |
| Seeds | 8 |
Julie Halard-Decugis was the defending champion but did not compete this year, as she retired from professional tennis at the end of the 2000 season.
First-seeded Monica Seles won the title by defeating second-seeded Tamarine Tanasugarn 6–3, 6–2 in the final.
The top two seeds received a bye into the second round.
Monica Seles (champion) Tamarine Tanasugarn (final)
Ai Sugiyama (semifinals) Meilen Tu (first round)
Marlene Weingärtner (second round)
Rita Grande (quarterfinals)
Nathalie Dechy (second round)
Joannette Kruger (semifinals)| Semifinals | Final | ||||||||||||
| 1 | Monica Seles | 7 | 6 | ||||||||||
| 3 | Ai Sugiyama | 5 | 4 | ||||||||||
| 1 | Monica Seles | 6 | 6 | ||||||||||
| 2 | Tamarine Tanasugarn | 3 | 2 | ||||||||||
| 8 | Joannette Kruger | 3 | 5 | ||||||||||
| 2 | Tamarine Tanasugarn | 6 | 7 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Seles | 6 | 6 | ||||||||||||||||||||||||
 A Molik | 4 | 77 | 5 | Q |  Y-j Cho | 2 | 3 | ||||||||||||||||||||
| Q | Y-j Cho | 6 | 63 | 7 | 1 | M Seles | 6 | 6 | |||||||||||||||||||
 R de los Ríos | 3 | 2 | 6 | R Grande | 1 | 2 | |||||||||||||||||||||
 B Schwartz | 6 | 6 | B Schwartz | 4 | 4 | ||||||||||||||||||||||
 T Pisnik | 7 | 63 | 4 | 6 | R Grande | 6 | 6 | ||||||||||||||||||||
| 6 | R Grande | 5 | 77 | 6 | 1 | M Seles | 7 | 6 | |||||||||||||||||||
| 3 | A Sugiyama | 6 | 6 | 3 | A Sugiyama | 5 | 4 | ||||||||||||||||||||
 Z Gubacsi | 4 | 1 | 3 | A Sugiyama | 6 | 3 | 6 | ||||||||||||||||||||
 Ľ Cervanová | 4 | 2 | K Srebotnik | 2 | 6 | 1 | |||||||||||||||||||||
| K Srebotnik | 6 | 6 | 3 | A Sugiyama | 6 | 6 | |||||||||||||||||||||
| Q | Y-j Choi | 6 | 3 | 2 |  P Nola | 1 | 4 | ||||||||||||||||||||
| P Nola | 4 | 6 | 6 | P Nola | 6 | 4 | 77 | ||||||||||||||||||||
| R McQuillan | 1 | 4 | 7 | N Dechy | 3 | 6 | 65 | ||||||||||||||||||||
| 7 | N Dechy | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | J Kruger | 7 | 7 | ||||||||||||||||||||||||
 J Lee | 5 | 5 | 8 | J Kruger | 4 | 6 | 77 | ||||||||||||||||||||
| N Pratt | 6 | 6 | N Pratt | 6 | 3 | 63 | |||||||||||||||||||||
| WC | R Fujiwara | 2 | 4 | 8 | J Kruger | 0 | 6 | 6 | |||||||||||||||||||
| S Asagoe | 6 | 67 | 4 |  E Gagliardi | 6 | 4 | 1 | ||||||||||||||||||||
 W Prakusya | 3 | 79 | 6 | W Prakusya | 3 | 6 | 5 | ||||||||||||||||||||
| E Gagliardi | 3 | 6 | 6 | E Gagliardi | 6 | 1 | 7 | ||||||||||||||||||||
| 4 | M Tu | 6 | 2 | 1 | 8 | J Kruger | 3 | 5 | |||||||||||||||||||
| 5 | M Weingärtner | 3 | 7 | 6 | 2 | T Tanasugarn | 6 | 7 | |||||||||||||||||||
| E Dominikovic | 6 | 5 | 3 | 5 | M Weingärtner | 1 | 7 | 3 | |||||||||||||||||||
| Q | A Fusai | 3 | 2 | WC | S Obata | 6 | 5 | 6 | |||||||||||||||||||
| WC | S Obata | 6 | 6 | WC | S Obata | 0 | 2 | ||||||||||||||||||||
| Q | M Saeki | 6 | 63 | 2 | 2 | T Tanasugarn | 6 | 6 | |||||||||||||||||||
| J Craybas | 0 | 77 | 6 | J Craybas | 4 | 6 | 3 | ||||||||||||||||||||
| 2 | T Tanasugarn | 6 | 4 | 6 | |||||||||||||||||||||||
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