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| Hobart Tier V Hard | Jan 18 2004 |
| Qual 1 | Nakamura - Kildine Chevalier | 6-0 6-1 |
| Qual 2 | Ma. Emilia Salerni - Nakamura | 6-2 6-1 |
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| Australian Open Hard | Feb 1 2004 |
| Qual 1 | Yulia Beygelzimer(5) - Nakamura | 4-6 7-5 6-1 |
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| Pan Pacific Open Tier I Carpet | Feb 8 2004 |
| Qual 1 | Nakamura - Miho Saeki-WC | 6-2 6-3 |
| Qual 2 | Julia Vakulenko(7) - Nakamura | 6-4 6-2 |
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| Hyderabad Tier IV Clay | Feb 22 2004 |
| Qual 1 | Nakamura(5) - Iciri Rai-WC | 6-3 6-0 |
| Qual 2 | Shikha Uberoi - Nakamura(5) | 7-5 6-3 |
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| Orange $50,000 Hard | Mar 21 2004 |
| Qual 1 | Anne Keothavong(8) - Nakamura | 6-0 6-1 |
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| Redding $25,000 Hard | Mar 28 2004 |
| 1 | Nakamura - Jewel Peterson-Q | 6-73 6-1 6-1 |
| 2 | Anne Keothavong - Nakamura | 7-64 6-4 |
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| Ho Chi Minh City $25,000 Hard | Apr 18 2004 |
| 1 | Nakamura(2) - Maki Arai | 6-3 6-3 |
| 2 | Nakamura(2) - Remi Tezuka | 7-68 4-6 6-0 |
| QF | Nakamura(2) - Beier Ko | 6-710 6-2 7-61 |
| SF | Suchanan Viratprasert(4) - Nakamura(2) | 6-3 6-3 |
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| Gifu $50,000 Carpet | May 2 2004 |
| 1 | Sophie Ferguson-Q - Nakamura(3) | 1-6 6-2 7-5 |
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| Fukuoka $50,000 Carpet | May 9 2004 |
| 1 | Nakamura(5) - Nana Miyagi-WC | 0-6 6-1 6-2 |
| 2 | Nakamura(5) - Lucie Safarova | 6-3 6-2 |
| QF | Ana Ivanovic-Q - Nakamura(5) | 6-4 6-4 |
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| Roland Garros Clay | Jun 6 2004 |
| Qual 1 | Yan Ze Xie - Nakamura | 6-3 7-5 |
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| Surbiton $25,000 Grass | Jun 6 2004 |
| 1 | Emily Webley-Smith - Nakamura | 4-6 6-3 7-5 |
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| Wimbledon Grass | Jul 4 2004 |
| Qual 1 | Yulia Beygelzimer(10) - Nakamura | 6-4 6-4 |
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| Kusatsu $25,000 Carpet | Jul 18 2004 |
| 1 | Nakamura(4) - Mari Inoue-WC | 6-0 6-0 |
| 2 | Nakamura(4) - Kaori Aoyama | 4-6 6-2 6-3 |
| QF | Nakamura(4) - Ryoko Fuda(7) | 6-4 6-0 |
| SF | Rika Fujiwara(5) - Nakamura(4) | 6-2 6-2 |
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| Lexington $50,000 Hard | Aug 1 2004 |
| 1 | Nakamura - Shuai Peng(1) | 2-6 6-2 7-5 |
| 2 | Nakamura - Jarmila Gajdosova | 6-1 6-3 |
| QF | Nan-Nan Liu-Q - Nakamura | 3-6 6-1 7-5 |
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| Louisville $50,000 Hard | Aug 8 2004 |
| 1 | Nakamura - Natalie Grandin(6) | 6-3 6-2 |
| 2 | Nakamura - Julie Ditty | 6-4 6-1 |
| QF | Nakamura - Shikha Uberoi-Q | 6-2 4-6 6-0 |
| SF | Nakamura - Jamea Jackson | 4-6 2-3 |
| F | Nakamura - Vilmarie Castellvi(4) | 6-4 6-2 |
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| Bronx $50,000 Hard | Aug 22 2004 |
| Qual 1 | Nakamura(1) - Tamara Encina | 6-1 6-3 |
| Qual 2 | Nakamura(1) - Anne Yelsey | 6-1 6-2 |
| Qual 3 | Na Li(6) - Nakamura(1) | 6-2 6-2 |
| 1 | Nakamura-LL - Virginie Pichet(8) | 6-3 6-3 |
| 2 | Nakamura-LL - Jessica Lehnhoff | 6-2 6-0 |
| QF | Nuria Llagostera Vives(2) - Nakamura-LL | 6-1 7-5 |
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| US Open Hard | Sep 12 2004 |
| Qual 1 | Shahar Peer - Nakamura | 7-5 5-7 7-5 |
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| Bali Tier III Hard | Sep 19 2004 |
| Qual 1 | Nakamura(6) - Nudnida Luangnam-WC | 6-0 6-1 |
| Qual 2 | Nakamura(6) - Jennifer Hopkins(3) | 4-6 6-3 6-4 |
| 1 | Nakamura-Q - Ai Sugiyama(3) | 6-4 7-61 |
| 2 | Marlene Weingartner - Nakamura-Q | 7-5 6-3 |
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| Beijing Tier II Hard | Sep 26 2004 |
| Qual 1 | Marta Marrero(2) - Nakamura | 7-5 6-3 |
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| Guangzhou Tier III Hard | Oct 3 2004 |
| Qual 1 | Nakamura(2) | bye |
| Qual 2 | Nakamura(2) - Chun-Yan He-WC | 6-1 6-4 |
| Qual 3 | Na Li(6)-WC - Nakamura(2) | 6-2 6-1 |
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| Japan Open Tier III Hard | Oct 10 2004 |
| 1 | Samantha Stosur-Q - Nakamura | 6-3 7-5 |
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| Haibara $25,000 Carpet | Oct 24 2004 |
| 1 | Nakamura(1) - Su-Wei Hsieh | 6-0 6-2 |
| 2 | Nakamura(1) - Kaori Aoyama | 6-1 6-2 |
| QF | Nakamura(1) - Jin-Hee Kim | 4-6 6-2 6-2 |
| SF | Nakamura(1) - Rika Fujiwara(3) | 6-2 6-3 |
| F | Nakamura(1) - Yuka Yoshida(2) | 6-1 6-4 |
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| Shenzhen $50,000 Hard | Oct 31 2004 |
| 1 | Nakamura(5) - Chun Mei Ji | 6-0 6-1 |
| 2 | Nakamura(5) - Nina Bratchikova | 6-3 3-0 |
| QF | Nakamura(5) - Mi-Ra Jeon | 6-1 4-6 6-2 |
| SF | Tian Tian Sun(4) - Nakamura(5) | 6-2 7-5 |
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| Shenzhen $50,000 Hard | Nov 7 2004 |
| 1 | Nakamura(6) - Chia-Jung Chuang | 6-2 6-3 |
| 2 | Yan-Chong Chen - Nakamura(6) | 7-5 4-6 6-2 |