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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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| Yamaguchi $10,000 Clay | Apr 24 2005 |
| Qual 1 | Oka(6) - Kana Watanabe | 6-0 6-1 |
| Qual 2 | Yuko Kurata(11) - Oka(6) | 6-2 6-0 |
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| Nagano $25,000 Carpet | May 29 2005 |
| 1 | Keiko Taguchi - Oka | 6-2 7-5 |
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| Gunma $25,000 Carpet | Jun 5 2005 |
| 1 | Oka - Tomoyo Takagishi | 6-1 4-6 6-1 |
| 2 | Ayami Takase(5) - Oka | 6-2 6-2 |
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| Tokyo $10,000 Hard | Jun 12 2005 |
| 1 | Maya Kato(2)-Q - Oka | 7-65 6-3 |
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| Kurume $25,000 Carpet | Jul 24 2005 |
| Qual 1 | Hae-Youm Bae - Oka(11) | 3-6 7-5 6-3 |
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| Saitama $10,000 Hard | Sep 4 2005 |
| 1 | Oka - Yuri Kasuya-Q | 5-7 7-5 7-5 |
| 2 | Mari Tanaka(2) - Oka | 7-64 6-3 |
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| Kyoto $10,000 Carpet | Sep 11 2005 |
| Qual 1 | Oka(2) - Seika Takahara | 6-0 6-2 |
| Qual 2 | Oka(2) - Misae Sakai(9) | 6-1 6-0 |
| 1 | Tomoko Sugano(8) - Oka-Q | 6-4 6-4 |
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| Hiroshima $10,000 Carpet | Sep 18 2005 |
| Qual 1 | Chiaki Okadaue - Oka(4) | 6-0 7-5 |
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| Ibaraki $25,000 Hard | Sep 25 2005 |
| 1 | Tomoko Dokei(8) - Oka | 6-3 7-5 |
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| Makinohara $25,000 Carpet | Oct 23 2005 |
| Qual 1 | Oka - Maya Kato(16) | 6-3 6-3 |
| Qual 2 | Oka - Haruka Fujishiro | 6-2 6-1 |
| 1 | Oka-Q - Natsumi Hamamura | 7-63 4-6 6-3 |
| 2 | Alisa Kleybanova - Oka-Q | 6-1 6-3 |
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| Tokyo $10,000 Hard | Oct 30 2005 |
| Qual 1 | Oka(1) | bye |
| Qual 2 | Oka(1) - Kana Okawa | 6-4 7-5 |
| Qual 3 | Oka(1) - Atsumi Koga | 6-3 1-6 6-2 |
| 1 | Cassandra Barr - Oka-Q | 7-63 6-72 6-1 |
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| Sutama $25,000 Clay | Nov 6 2005 |
| Qual 1 | Oka(6) - Tamami Kamiyama | 6-1 6-2 |
| Qual 2 | Oka(6) - Moe Tsubuku | 6-2 6-3 |
| 1 | Kaori Aoyama - Oka-Q | 7-5 6-1 |
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| Port Pirie $25,000 Hard | Nov 13 2005 |
| Qual 1 | Oka(8) - Paige Thomas | 6-1 6-1 |
| Qual 2 | Oka(8) - Kara Knight | 6-3 6-0 |
| Qual 3 | Oka(8) - Shannon Golds(14) | 3-6 6-3 6-1 |
| 1 | Nadja Pavic(9) - Oka-Q | 6-2 2-6 7-66 |
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| Nuriootpa $25,000 Hard | Nov 20 2005 |
| Qual 1 | Oka(14) - Ivana Vuletic | 6-0 6-0 |
| Qual 2 | Oka(14) - Eden Marama | 6-3 6-4 |
| Qual 3 | Lisa D'Amelio(8) - Oka(14) | 6-1 6-2 |
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| Mount Gambier $25,000 Hard | Nov 27 2005 |
| Qual 1 | Oka(11) - Kelli Zahmel | 4-6 6-2 6-2 |
| Qual 2 | Oka(11) - Prue Teitzel | 6-1 6-2 |
| Qual 3 | Nudnida Luangnam(6) - Oka(11) | 6-1 7-5 |
| 1 | Melanie South-Q - Oka-LL | 6-2 6-1 |
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