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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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| Balikpapan $25,000 Hard | May 4 2008 |
| 1 | Ayu Fani Damayanti - Oka(7) | 7-5 7-5 |
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| Tarakan $10,000 Hard | May 11 2008 |
| Qual 1 | Oka(1) | bye |
| Qual 2 | Oka(1) - Zi-Jun Yang | 5-7 6-3 7-5 |
| 1 | Oka(3) - Ayu Fani Damayanti | 6-3 6-4 |
| 2 | Oka(3) - Lutfiana Aris-Budiharto | 6-1 6-3 |
| QF | Lavinia Tananta(7) - Oka(3) | 4-6 6-1 6-4 |
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| Bulungan $10,000 Hard | May 18 2008 |
| 1 | Elena Tcherniakova - Oka(2) | 6-2 6-1 |
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| Nagano $25,000 Carpet | May 25 2008 |
| Qual 1 | Oka(2) - Saori Karikomi | 6-2 6-2 |
| Qual 2 | Oka(2) - Ting Li (jr)(14) | 6-4 4-6 7-63 |
| 1 | Remi Tezuka - Oka | 7-62 6-3 |
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| Gunma $25,000 Carpet | Jun 1 2008 |
| Qual 1 | Oka(4) - Yurina Koshino | 4-6 6-3 6-1 |
| Qual 2 | Oka(4) - So-Jung Kim(12) | 6-1 6-72 6-0 |
| 1 | Kumiko Iijima(2) - Oka | 2-6 7-5 6-4 |
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| Tokyo $10,000 Hard | Jun 15 2008 |
| 1 | Oka(6) - Yumi Nakano | 6-1 6-3 |
| 2 | Oka(6) - Kei Sekine | 4-6 6-4 6-1 |
| QF | Oka(6) - Yijing Zhao(2) | 6-3 6-4 |
| SF | Shiho Akita - Oka(6) | 7-65 6-2 |
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| Sutama $10,000 Clay | Jun 22 2008 |
| 1 | Oka(4) - Ai Yamamoto | 6-2 7-5 |
| 2 | Oka(4) - Kasumi Aiko | 6-1 6-0 |
| QF | Oka(4) - Ayaka Maekawa(6) | 1-6 7-5 6-4 |
| SF | Maki Arai - Oka(4) | 6-2 6-3 |
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| Tokyo $10,000 Carpet | Jul 13 2008 |
| 1 | Oka(4) - Jin-Hee Kim | 6-0 1-6 7-5 |
| 2 | Oka(4) - Kanae Hisami | 7-5 6-0 |
| QF | Oka(4) - Sakiko Shimizu | 2-6 6-4 6-1 |
| SF | Kyung Yee Chae(2) - Oka(4) | 6-4 6-1 |
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| Miyazaki $25,000 Carpet | Jul 20 2008 |
| 1 | Misaki Doi - Oka | 6-2 6-3 |
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| Saitama $10,000 Hard | Aug 31 2008 |
| 1 | Oka(4) - Yurina Koshino | 6-74 6-4 7-63 |
| 2 | Yuko Kurata - Oka(4) | 6-3 6-4 |
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| Tsukuba $25,000 Hard | Sep 7 2008 |
| Qual 1 | Oka(8) - Mai Minokoshi | 6-2 6-2 |
| Qual 2 | Oka(8) - Maki Arai | 6-3 2-6 6-3 |
| 1 | Oka - Naoko Eto | 6-1 6-1 |
| 2 | Yan Ze Xie - Oka | 6-1 6-2 |
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| Noto $25,000 Carpet | Sep 14 2008 |
| 1 | Oka - Chihiro Takayama | 6-4 4-6 6-4 |
| 2 | Maya Kato - Oka | 6-2 6-2 |
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| Kyoto $10,000 Carpet | Sep 21 2008 |
| 1 | Oka(3) - Etsuko Kitazaki | 6-4 6-2 |
| 2 | Akiko Omae - Oka(3) | 6-3 1-6 6-4 |
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| Makinohara $25,000 Carpet | Oct 19 2008 |
| Qual 1 | Oka(1) - Moe Kawatoko | 6-1 6-2 |
| Qual 2 | Oka(1) - Yuka Mori | 6-4 4-6 6-3 |
| 1 | Ksenia Palkina(5) - Oka | 7-65 0-6 6-1 |
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| Hamanako $25,000 Carpet | Oct 26 2008 |
| 1 | Natsumi Hamamura - Oka | 6-2 6-4 |
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| Tokyo $50,000 Hard | Nov 2 2008 |
| Qual 1 | Oka - Etsuko Kitazaki | 6-2 6-2 |
| Qual 2 | Kyung-Mi Chang(5) - Oka | 6-3 3-6 6-3 |
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| Toyota $75,000 Carpet | Nov 30 2008 |
| Qual 1 | Oka(4) - Yoko Naito | 6-3 4-6 6-0 |
| Qual 2 | Oka(4) - Akiko Omae | 2-6 6-3 6-4 |
| Qual 3 | Oka(4) - Etsuko Kitazaki | 6-2 6-3 |
| 1 | Oka - Remi Tezuka | 3-6 6-4 7-5 |
| 2 | Tomoko Yonemura(4) - Oka | 6-2 6-4 |
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