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| Redding $25,000 Hard | Mar 23 2003 |
| Qual 1 | Aiko Nakamura(17) - Nguyen-WC | 6-3 6-1 |
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| Coatzacoalcos $25,000 Hard | Apr 13 2003 |
| Qual 1 | Nguyen - Marcela Evangelista(15) | 6-4 6-2 |
| Qual 2 | Kildine Chevalier(8) - Nguyen | 4-6 6-3 6-1 |
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| San Luis Potosi $25,000 Clay | Apr 20 2003 |
| Qual 1 | Larissa Carvalho(5) - Nguyen | 6-3 6-2 |
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| El Paso $10,000 Hard | May 25 2003 |
| Qual 1 | Nguyen(16) | bye |
| Qual 2 | Nguyen(16) - Fernanda Silva | 6-0 6-0 |
| Qual 3 | Nguyen(16) - Rebekah Rhodes | 7-67 6-4 |
| Qual 4 | Olga Puchkova(8) - Nguyen(16) | 6-4 2-6 2-1 |
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| Los Gatos $50,000 Hard | Jul 6 2003 |
| Qual 1 | Natallia Dziamidzenka - Nguyen | 6-4 0-1 |
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| Harrisonburg $10,000 Hard | Aug 3 2003 |
| Qual 1 | Nguyen(5) | bye |
| Qual 2 | Nguyen(5) - Danielle Stadelmann | 6-0 6-1 |
| Qual 3 | Nguyen(5) - Audra Falk | 7-5 6-4 |
| 1 | Nguyen-Q - Aleke Tsoubanos-Q | 6-75 6-4 6-3 |
| 2 | Martina Muller(1) - Nguyen-Q | 3-6 6-3 7-61 |
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| Troy $50,000 Hard | Oct 5 2003 |
| Qual 1 | Kara Molony-Hussey - Nguyen | 6-3 2-6 6-4 |
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| Sedona $50,000 Hard | Oct 19 2003 |
| Qual 1 | Nguyen - Adriana Laughlin | 6-0 6-2 |
| Qual 2 | Nguyen - Andrea Van Den Hurk(4) | 6-2 6-2 |
| Qual 3 | Olga Puchkova(6) - Nguyen | 6-73 6-4 6-3 |