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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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| Quanzhou $50,000 Hard | Jan 9 2011 |
| Qual 1 | Kai-Lin Zhang - Oka(5) | 6-2 6-1 |
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| Pingguo $25,000 Hard | Jan 16 2011 |
| Qual 1 | Oka(3) | bye |
| Qual 2 | Qianqian Zhao - Oka(3) | 7-5 0-6 7-64 |
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| Miyazaki $10,000 Carpet | Mar 20 2011 |
| 1 | Yuuki Tanaka - Oka(3) | 6-4 6-1 |
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| Gifu $50,000 Hard | May 1 2011 |
| Qual 1 | Oka(6) - Miki Ukai | 6-3 5-7 6-4 |
| Qual 2 | Oka(6) - Yuka Higuchi | 7-65 7-5 |
| Qual 3 | Oka(6) - Hiroko Kuwata | 6-4 6-0 |
| 1 | Erika Takao - Oka | 6-4 7-5 |
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| Fukuoka $50,000 Carpet | May 8 2011 |
| Qual 1 | Kazusa Ito - Oka(7) | 6-3 3-6 7-5 |
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| Kurume $50,000 Grass | May 15 2011 |
| Qual 1 | Hirono Watanabe - Oka(6) | 6-0 6-2 |
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| Karuizawa $25,000 Carpet | May 22 2011 |
| 1 | Olga Puchkova(4) - Oka | 3-6 6-3 6-1 |
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| Niigata $25,000 Hard | May 29 2011 |
| 1 | Oka - Kaori Aoyama | 3-6 6-2 7-5 |
| 2 | Misa Eguchi - Oka | 6-0 6-3 |
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| Mie $10,000 Carpet | Jun 5 2011 |
| 1 | Makiho Kozawa - Oka(1) | 7-63 6-2 |
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| Tokyo $10,000 Hard | Jun 12 2011 |
| 1 | Oka(4) - Kanami Tsuji | 6-2 2-6 6-4 |
| 2 | Oka(4) - Yuka Higuchi | 6-4 2-6 6-2 |
| QF | Misa Eguchi(8) - Oka(4) | 6-3 6-2 |
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| Saitama $10,000 Hard | Aug 28 2011 |
| 1 | Oka - Ayaka Okuno | 6-4 6-0 |
| 2 | Oka - Yuka Higuchi | 7-65 7-5 |
| QF | Oka - Chen Liang(2) | 7-5 6-2 |
| SF | Oka - Yue-Yue Hu(3) | 6-4 7-5 |
| F | Oka - Ying-Ying Duan(1) | 6-3 6-4 |
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| Tsukuba $25,000 Hard | Sep 4 2011 |
| Qual 1 | Riko Sawayanagi - Oka(11) | 7-5 2-6 7-62 |
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| Noto $25,000 Carpet | Sep 11 2011 |
| Qual 1 | Oka(5) | bye |
| Qual 2 | Oka(5) - Shao-Yuan Kao | 4-6 6-1 6-1 |
| Qual 3 | Oka(5) - Yuka Higuchi(14) | 6-2 6-0 |
| 1 | Oka - Qiang Wang(3) | 6-2 6-0 |
| 2 | Oka - Chinami Ogi | 4-6 6-3 6-3 |
| QF | Erika Takao(8) - Oka | 6-4 6-72 6-0 |
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| Kyoto $10,000 Carpet | Sep 18 2011 |
| 1 | Oka(3) - Kotomi Takahata | 6-1 6-2 |
| 2 | Oka(3) - Ai Yamamoto | 6-3 6-1 |
| QF | Makiho Kozawa(6) - Oka(3) | 5-6 |
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| Pan Pacific Open Premier Hard | Oct 2 2011 |
| Qual 1 | Anastasia Rodionova(7) - Oka | 6-2 6-0 |
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| Kofu $50,000 Hard | Oct 9 2011 |
| 1 | Akiko Yonemura - Oka | 2-6 7-5 7-5 |
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| Osaka International Hard | Oct 16 2011 |
| Qual 1 | Risa Ozaki - Oka | 6-4 6-3 |
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| Makinohara $25,000 Carpet | Oct 23 2011 |
| 1 | Erika Sema(1) - Oka | 6-1 6-4 |
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| Hamanako $25,000 Carpet | Oct 30 2011 |
| 1 | Erika Takao(7) - Oka | 6-1 6-0 |
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| Toyota $75,000 Carpet | Nov 27 2011 |
| Qual 1 | Oka(8) - Aki Yamasoto | 6-2 7-5 |
| Qual 2 | Oka(8) - Risa Ozaki | 3-6 6-3 6-1 |
| Qual 3 | Oka(8) - Riko Sawayanagi | 4-6 6-2 6-1 |
| 1 | Oka - Erika Sema(4) | 6-2 6-2 |
| 2 | Zuzana Luknarova - Oka | 1-6 7-5 6-2 |
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