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A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z
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| Kofu $10,000 Hard | Mar 29 2009 |
| 1 | Qiang Wang - Oka(5) | 6-1 6-1 |
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| Gifu $50,000 Carpet | May 3 2009 |
| 1 | Oka - Elena Baltacha(1) | 6-2 6-4 |
| 2 | Oka - Elena Chalova | 6-1 6-2 |
| QF | Oka - Ksenia Lykina | 6-4 6-3 |
| SF | Aiko Nakamura(5) - Oka | 6-1 6-2 |
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| Fukuoka $50,000 Carpet | May 10 2009 |
| Qual 1 | Akiko Omae - Oka(2) | 6-1 6-0 |
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| Kurume $50,000 Carpet | May 17 2009 |
| Qual 1 | Oka(1) - Sayako Matsunaga | 6-3 6-0 |
| Qual 2 | Oka(1) - Chihiro Takayama | 6-2 6-4 |
| Qual 3 | Oka(1) - Alison Bai | 6-1 6-3 |
| 1 | Oka - Miki Miyamura | 5-7 7-5 6-2 |
| 2 | Jing-Jing Lu(2) - Oka | 6-72 6-3 6-3 |
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| Nagano $25,000 Carpet | May 24 2009 |
| 1 | Oka - Julia Moriarty | 3-6 6-3 6-4 |
| 2 | Oka - Seiko Okamoto(7) | 6-3 4-6 6-2 |
| QF | Nikola Hofmanova(3) - Oka | 6-2 6-4 |
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| Gunma $25,000 Carpet | May 31 2009 |
| 1 | Oka(7) - Chinami Ogi | 6-3 6-1 |
| 2 | Oka(7) - Misaki Doi | 6-3 6-1 |
| QF | Junri Namigata(2) - Oka(7) | 6-77 6-2 7-5 |
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| Komoro $25,000 Clay | Jun 7 2009 |
| 1 | Oka(7) - Varatchaya Wongteanchai | 7-5 6-3 |
| 2 | Mari Inoue - Oka(7) | 6-4 6-0 |
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| Tokyo $10,000 Hard | Jun 14 2009 |
| 1 | Oka(1) - Maya Kato | 7-64 6-0 |
| 2 | Oka(1) - Mari Inoue | 6-3 6-3 |
| QF | Erika Takao(5) - Oka(1) | 6-2 6-4 |
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| Miyazaki $10,000 Carpet | Jul 19 2009 |
| 1 | Oka(2) - Juri Fukushima | 6-2 6-1 |
| 2 | Oka(2) - Chiho Kobayashi | 7-5 6-2 |
| QF | Oka(2) - Kana Watanabe | 6-4 6-3 |
| SF | Shiho Akita(3) - Oka(2) | 6-3 6-3 |
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| Obihiro $25,000 Carpet | Aug 2 2009 |
| 1 | Rika Fujiwara(1) - Oka | 6-2 6-4 |
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| Quanzhou $25,000 Hard | Aug 16 2009 |
| 1 | Jia-Jing Lu - Oka | 6-3 6-2 |
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| Pingguo $25,000 Hard | Aug 23 2009 |
| 1 | Ayaka Maekawa - Oka | 6-3 6-3 |
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| Tsukuba $25,000 Hard | Sep 6 2009 |
| 1 | Erika Takao - Oka | 6-0 6-1 |
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| Noto $25,000 Carpet | Sep 13 2009 |
| 1 | Oka - Chihiro Takayama | 6-4 3-6 7-5 |
| 2 | Oka - Yi-Fan Xu | 6-4 6-3 |
| QF | Kristyna Pliskova - Oka | 6-4 6-1 |
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| Kyoto $10,000 Carpet | Sep 20 2009 |
| 1 | Oka(1) - Tomoko Dokei | 6-4 6-4 |
| 2 | Oka(1) - Aika Nonaka | 6-2 6-0 |
| QF | Oka(1) - Mari Tanaka(8) | 6-2 6-4 |
| SF | Nungnadda Wannasuk(7) - Oka(1) | 6-76 6-3 6-3 |
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| Makinohara $25,000 Carpet | Sep 27 2009 |
| 1 | Oka(8) - Mari Inoue | 7-5 6-1 |
| 2 | Montinee Tangphong - Oka(8) | 3-6 6-1 7-64 |
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| Hamanako $25,000 Carpet | Oct 4 2009 |
| 1 | Akiko Yonemura - Oka | 3-6 7-65 6-2 |
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| Tokyo $100,000 Hard | Oct 11 2009 |
| Qual 1 | Ye-Ra Lee - Oka(2) | 6-4 6-2 |
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| Osaka International Hard | Oct 18 2009 |
| Qual 1 | Ana Bogdan - Oka | 6-3 6-4 |
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| Taipei $100,000 Hard | Nov 8 2009 |
| Qual 1 | Noppawan Lertcheewakarn - Oka(5) | 7-63 6-3 |
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| Kalgoorlie $25,000 Hard | Nov 29 2009 |
| 1 | Shannon Golds(3) - Oka | 6-3 6-2 |
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| Bendigo $25,000 Hard | Dec 6 2009 |
| 1 | Oka - Shannon Golds(4) | 3-2 |
| 2 | Isabella Holland - Oka | 6-3 7-5 |
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