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| Toluca $10,000 Hard | Mar 13 2005 |
| Qual 1 | Elizabeth Kaufman(12) - Villalobos | 6-2 3-6 6-2 |
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| Morelia $10,000 Hard | Mar 20 2005 |
| 1 | Villalobos - Florence Haring(5) | 6-4 6-4 |
| 2 | Erica Biro - Villalobos | 6-2 6-76 6-2 |
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| San Luis Potosi $25,000 Hard | Mar 27 2005 |
| 1 | Kyra Nagy - Villalobos | 6-1 6-4 |
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| Poza Rica $25,000 Hard | Apr 3 2005 |
| Qual 1 | Giulia Casoni(8) - Villalobos | 7-65 6-0 |
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| Coatzacoalcos $25,000 Hard | Apr 10 2005 |
| Qual 1 | Jenifer Widjaja(16) - Villalobos | 6-3 6-1 |
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| Tampico $10,000 Hard | Apr 17 2005 |
| 1 | Patricia Holzman - Villalobos | 6-2 4-6 7-5 |
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| Obregon $10,000 Hard | May 8 2005 |
| 1 | Elizabeth Kaufman - Villalobos | 6-3 6-75 6-3 |
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| Los Mochis $10,000 Clay | May 15 2005 |
| Qual 1 | Villalobos(2) | bye |
| Qual 2 | Maria Irigoyen - Villalobos(2) | 7-64 6-4 |
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| Mazatlan $10,000 Hard | May 22 2005 |
| Qual 1 | Villalobos(3) - Maria-Paula Aguirre | 6-2 6-2 |
| Qual 2 | Villalobos(3) - Khushchehr Italia | 7-5 6-3 |
| 1 | Anna Bartenstein-Q - Villalobos-Q | 6-4 2-6 6-0 |
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| Leon $10,000 Hard | May 29 2005 |
| 1 | Villalobos - Natalia Garbellotto(4) | 6-4 6-1 |
| 2 | Patricia Holzman - Villalobos | 6-2 6-4 |
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| Monterrey $10,000 Hard | Jun 5 2005 |
| 1 | Villalobos - Sheila Guerberg | 5-7 6-1 6-3 |
| 2 | Andrea Benitez(4) - Villalobos | 6-3 6-2 |
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| Davos $10,000 Clay | Jun 26 2005 |
| Qual 1 | Alessandra Di Batte - Villalobos(2) | 6-4 7-62 |
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| Mont de Marsan $25,000 Clay | Jul 3 2005 |
| Qual 1 | Jorgelina Cravero(4) - Villalobos | 6-1 6-3 |
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| Le Touquet $10,000 Clay | Jul 10 2005 |
| 1 | Charlene Vanneste(6) - Villalobos | 6-1 6-0 |
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| Les Contamines $25,000 Clay | Jul 24 2005 |
| Qual 1 | Mari Andersson(13) - Villalobos | 6-4 6-2 |
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| Matamoros $10,000 Hard | Sep 18 2005 |
| 1 | Villalobos - Marilyn Baker | 6-2 6-0 |
| 2 | Paula Zabala(4) - Villalobos | 6-3 6-1 |
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| Morelia $10,000 Hard | Oct 2 2005 |
| 1 | Villalobos(6) - Maria Fernanda Riveroll | 6-3 6-3 |
| 2 | Villalobos(6) - Deyanir Solorio | 6-3 6-1 |
| QF | Valeria Pulido-Q - Villalobos(6) | 6-2 6-4 |
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| Juarez $50,000 Clay | Oct 9 2005 |
| 1 | Villalobos - Paula Zabala | 7-65 7-62 |
| 2 | Katarina Kachlikova(4) - Villalobos | 6-2 6-0 |
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| Victoria $25,000 Hard | Oct 16 2005 |
| 1 | Valentina Sassi - Villalobos | 6-4 6-4 |
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| Mexico City $25,000 Hard | Oct 23 2005 |
| Qual 1 | Villalobos(14) - Alise Vaidere | 6-4 7-63 |
| Qual 2 | Agnes Szatmari(5) - Villalobos(14) | 6-2 7-5 |
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| Mexico City $25,000 Hard | Oct 30 2005 |
| Qual 1 | Villalobos(14) - Maria-Paula Hernandez | 6-0 6-1 |
| Qual 2 | Francesca Lubiani(5) - Villalobos(14) | 5-7 6-2 6-1 |
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| Mexico City $25,000 Clay | Nov 13 2005 |
| Qual 1 | Francesca Lubiani(10) - Villalobos | 6-3 6-2 |
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| Puebla $25,000 Hard | Nov 20 2005 |
| Qual 1 | Julia Cohen(12) - Villalobos | 6-3 6-1 |
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| San Luis Potosi $25,000 Hard | Nov 27 2005 |
| Qual 1 | Villalobos - Paula Zabala(8) | 7-66 6-2 |
| Qual 2 | Sophie Lefevre(13) - Villalobos | 6-3 6-2 |