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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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| Fukuoka $50,000 Carpet | May 14 2006 |
| Qual 1 | Oka - Erika Sema | 3-6 6-4 7-5 |
| Qual 2 | Kanae Hisami - Oka | 7-62 6-4 |
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| Nagano $25,000 Carpet | May 28 2006 |
| Qual 1 | Oka(8) - Ai Matsuura | 6-1 6-1 |
| Qual 2 | Oka(8) - Sayaka Umeda(16) | 6-1 6-4 |
| 1 | Kanae Hisami-Q - Oka-Q | 5-7 6-3 6-2 |
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| Gunma $25,000 Carpet | Jun 4 2006 |
| Qual 1 | Oka(9) - Marina Takimura | 6-3 6-0 |
| Qual 2 | Eriko Mizuno(6) - Oka(9) | 6-1 6-3 |
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| Tokyo $10,000 Hard | Jun 11 2006 |
| 1 | Oka(8) - Haruka Fujishiro | 4-6 6-4 6-1 |
| 2 | Yuko Kurata - Oka(8) | walkover |
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| Inchon $25,000 Hard | Jun 18 2006 |
| Qual 1 | Oka(12) - Hae-Youm Bae | 6-2 6-1 |
| Qual 2 | Sung-Hee Han - Oka(12) | 6-3 7-63 |
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| Changwon $25,000 Hard | Jun 25 2006 |
| Qual 1 | Oka(15) - Hye-Mi Byun | 4-6 6-0 6-1 |
| Qual 2 | Yoo-Ri Bae - Oka(15) | 6-1 6-3 |
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| Nagoya $25,000 Hard | Jul 9 2006 |
| 1 | Chiaki Okadaue-Q - Oka | 6-3 6-4 |
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| Miyazaki $25,000 Carpet | Jul 16 2006 |
| Qual 1 | Oka(12) - Juri Fukushima | 6-4 6-2 |
| Qual 2 | Chiaki Okadaue(8) - Oka(12) | 6-1 6-4 |
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| Kurume $25,000 Carpet | Jul 23 2006 |
| Qual 1 | Oka(6) - Machiko Shigefuji | 6-1 6-0 |
| Qual 2 | Kasumi Aiko(16) - Oka(6) | 3-6 6-3 6-4 |
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| Tokachi $25,000 Carpet | Aug 6 2006 |
| 1 | Tomoko Yonemura(5) - Oka | 6-2 6-1 |
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| Tokyo $10,000 Hard | Aug 20 2006 |
| 1 | Anastasia Malhotra - Oka(5) | 6-2 6-2 |
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| Saitama $10,000 Hard | Sep 3 2006 |
| 1 | Oka(8) - Reina Ishihara-Q | 6-3 6-3 |
| 2 | Anastasia Malhotra - Oka(8) | 6-1 6-0 |
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| Kyoto $10,000 Carpet | Sep 10 2006 |
| 1 | Oka(8) - Maya Kato | 6-0 6-4 |
| 2 | Oka(8) - Eriko Mizuno | 6-3 6-4 |
| QF | Maika Ozaki - Oka(8) | 6-4 6-0 |
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| Hiroshima $10,000 Carpet | Sep 17 2006 |
| 1 | Oka(5) - Maya Kato | 5-7 6-3 6-0 |
| 2 | Oka(5) - Minori Takemoto-Q | 6-3 6-3 |
| QF | Natsumi Hamamura(3) - Oka(5) | 6-2 6-3 |
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| Ibaraki $25,000 Hard | Sep 24 2006 |
| Qual 1 | Oka(12) - Momoko Urakawa | 6-1 6-2 |
| Qual 2 | Oka(12) - Keiko Taguchi(5) | 6-3 6-3 |
| 1 | Trudi Musgrave - Oka-Q | 5-7 7-5 6-4 |
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| Tokyo $50,000 Hard | Oct 1 2006 |
| Qual 1 | Oka - Mari Yamauchi | 6-1 6-0 |
| Qual 2 | Oka - Tomoko Dokei | 6-3 6-2 |
| Qual 3 | Oka - Ayaka Maekawa | 6-3 6-2 |
| 1 | Nudnida Luangnam-Q - Oka-Q | 6-1 6-1 |
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| Makinohara $25,000 Carpet | Oct 22 2006 |
| Qual 1 | Oka(5) - Ayumi Okuma | 6-1 6-2 |
| Qual 2 | Oka(5) - Eriko Mizuno(10) | 2-6 6-3 6-2 |
| 1 | Mayumi Yamamoto - Oka-Q | 6-4 7-64 |
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| Hamanako $25,000 Carpet | Oct 29 2006 |
| Qual 1 | Oka(6) - Yuko Kurata | 6-1 6-1 |
| Qual 2 | Oka(6) - Maya Kato(14) | 1-6 6-2 6-4 |
| 1 | Oka-Q - Natsumi Yokota | 5-7 6-0 6-3 |
| 2 | Erika Takao(1) - Oka-Q | 6-1 6-2 |
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| Sutama $25,000 Clay | Nov 5 2006 |
| Qual 1 | Oka(2) - Kaori Onishi | 6-2 6-1 |
| Qual 2 | Oka(2) - Yumi Miyazaki(14) | 3-6 6-2 6-3 |
| 1 | Florence Haring(6) - Oka-Q | 2-6 6-3 6-0 |
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| Nuriootpa $25,000 Hard | Nov 26 2006 |
| Qual 1 | Oka(7) - Kara Knight | 6-2 6-1 |
| Qual 2 | Oka(7) - Abby Hedges | 6-2 6-0 |
| Qual 3 | Ellen Barry(14) - Oka(7) | 6-2 6-3 |
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