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| Monterrey $10,000 Hard | Mar 28 2004 |
| Qual 1 | Maja Petrovic - Villalobos | 6-73 6-3 7-5 |
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| Obregon $10,000 Hard | Apr 4 2004 |
| 1 | Sabrina Eisenberg(7) - Villalobos | 6-1 6-1 |
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| Morelia $10,000 Hard | Apr 18 2004 |
| Qual 1 | Villalobos - Gloria Castro | 6-1 6-3 |
| Qual 2 | Sarah Riske(1) - Villalobos | 6-0 6-3 |
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| Poza Rica $25,000 Hard | Apr 25 2004 |
| 1 | Seda Noorlander(1) - Villalobos-WC | 6-0 7-62 |
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| Coatzacoalcos $25,000 Hard | May 2 2004 |
| Qual 1 | Nuria Roig(2) - Villalobos-WC | 6-1 6-4 |
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| Merida $10,000 Hard | May 9 2004 |
| 1 | Anne Mall-Q - Villalobos-WC | 6-0 6-0 |
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| Mexico City $10,000 Hard | Sep 5 2004 |
| Qual 1 | Villalobos - Maria Fernanda Riveroll | 7-5 7-5 |
| Qual 2 | Villalobos - Alejandra Obregon | 7-65 6-0 |
| 1 | Erika Clarke(3) - Villalobos-Q | 6-76 6-4 7-5 |
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| CD Victoria $10,000 Hard | Sep 12 2004 |
| Qual 1 | Lauren Fisher - Villalobos | 6-4 6-1 |
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| Matamoros $10,000 Hard | Sep 19 2004 |
| 1 | Tamara Encina - Villalobos | 6-4 6-3 |
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| Mexico City $25,000 Hard | Oct 17 2004 |
| 1 | Olga Blahotova(2) - Villalobos-WC | 6-3 6-1 |
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| Aguascalientes $10,000 Clay | Oct 24 2004 |
| 1 | Villalobos-WC - Stephanie Schaer | 6-2 4-0 |
| 2 | Flavia Mignola(2) - Villalobos-WC | 1-6 7-5 6-4 |
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| Los Mochis $10,000 Clay | Oct 31 2004 |
| 1 | Liset Brito Herrera - Villalobos | 6-3 6-2 |
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| Mexico City $10,000 Hard | Nov 14 2004 |
| Qual 1 | Villalobos(11) - Maria Fernanda Acosta | 6-0 6-2 |
| Qual 2 | Teodora Mircic(4) - Villalobos(11) | 6-4 7-5 |
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| Puebla $25,000 Hard | Nov 21 2004 |
| Qual 1 | Erika Clarke(11) - Villalobos-WC | 6-3 6-4 |
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| San Luis Potosi $25,000 Hard | Nov 28 2004 |
| Qual 1 | Heidi El Tabakh(13) - Villalobos | 6-2 6-3 |