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| Midland $75,000 Hard | Feb 15 2004 |
| Qual 1 | Stephanie Hazlett-WC - Lehnhoff | 6-4 7-64 |
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| Columbus $25,000 Hard | Feb 22 2004 |
| 1 | Lehnhoff - Cory Ann Avants-Q | 3-6 6-2 7-5 |
| 2 | Kelly McCain(8) - Lehnhoff | 4-6 6-2 6-3 |
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| Augusta $25,000 Hard | Apr 4 2004 |
| Qual 1 | Lehnhoff(7) - Mayumi Yamamoto | 6-1 6-0 |
| Qual 2 | Lehnhoff(7) - Francesca Lubiani | 6-4 6-3 |
| 1 | Tara Snyder(2) - Lehnhoff-Q | 6-3 6-3 |
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| Jackson $25,000 Clay | Apr 18 2004 |
| 1 | Salome Devidze-Q - Lehnhoff | 6-4 6-1 |
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| Dothan $75,000 Clay | Apr 25 2004 |
| Qual 1 | Lehnhoff(4) - Leanne Baker | 6-3 6-3 |
| Qual 2 | Lehnhoff(4) - Monique Adamczak | 7-65 6-0 |
| Qual 3 | Lehnhoff(4) - Milangela Morales | 6-1 6-2 |
| 1 | Lehnhoff-Q - Janet Lee | 6-4 6-2 |
| 2 | Lehnhoff-Q - Bea Bielik | 6-4 6-3 |
| QF | Lehnhoff-Q - Yan Ze Xie | 1-6 7-5 6-4 |
| SF | Shuai Peng - Lehnhoff-Q | 6-2 6-3 |
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| Raleigh $50,000 Clay | May 9 2004 |
| 1 | Lehnhoff - Yan Ze Xie | 3-6 6-4 6-2 |
| 2 | Mashona Washington(4) - Lehnhoff | 6-2 6-3 |
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| Charlottesville $50,000 Clay | May 16 2004 |
| 1 | Lehnhoff - Erica Krauth-Q | 2-6 6-2 6-4 |
| 2 | Lehnhoff - Jewel Peterson | 6-3 7-5 |
| QF | Jamea Jackson-Q - Lehnhoff | 6-1 6-1 |
| | |
| Roland Garros Clay | Jun 6 2004 |
| Qual 1 | Lehnhoff - Angelika Bachmann | 4-6 6-4 6-4 |
| Qual 2 | Lehnhoff - Mariya Koryttseva | 4-6 7-60 6-2 |
| Qual 3 | Yuliana Fedak(10) - Lehnhoff | 6-0 6-2 |
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| Surbiton $25,000 Grass | Jun 6 2004 |
| 1 | Vilmarie Castellvi(8) - Lehnhoff | 6-4 6-4 |
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| Wimbledon Grass | Jul 4 2004 |
| Qual 1 | Adriana Serra-Zanetti(20) - Lehnhoff | 6-4 6-1 |
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| Lexington $50,000 Hard | Aug 1 2004 |
| 1 | Julie Ditty - Lehnhoff | 6-1 6-1 |
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| Louisville $50,000 Hard | Aug 8 2004 |
| 1 | Lehnhoff(7) - Kelly Liggan | 7-63 0-6 6-3 |
| 2 | Sarah Fansler-WC - Lehnhoff(7) | 5-7 6-4 6-2 |
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| Bronx $50,000 Hard | Aug 22 2004 |
| 1 | Lehnhoff - Bea Bielik-WC | 6-1 6-2 |
| 2 | Aiko Nakamura-LL - Lehnhoff | 6-2 6-0 |
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| US Open Hard | Sep 12 2004 |
| Qual 1 | Yulia Beygelzimer(18) - Lehnhoff | 6-3 6-4 |
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| Cary $50,000 Hard | Oct 24 2004 |
| 1 | Shenay Perry(3) - Lehnhoff | 6-0 6-4 |
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| Quebec Tier III Hard | Nov 7 2004 |
| Qual 1 | Lehnhoff(7) - Stacia Fonseca | 6-4 6-3 |
| Qual 2 | Kelly Liggan - Lehnhoff(7) | 6-3 6-3 |
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| Pittsburgh $50,000 Hard | Nov 14 2004 |
| 1 | Jamea Jackson - Lehnhoff | 6-4 6-1 |
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| Tucson $50,000 Hard | Nov 21 2004 |
| 1 | Jamea Jackson(8) - Lehnhoff | 6-4 6-3 |
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| Palm Beach Gardens $50,000 Clay | Dec 5 2004 |
| 1 | Erica Krauth - Lehnhoff | 6-3 6-3 |