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| Bogota Tier III Clay | Feb 26 2006 |
| Qual 1 | Zsofia Gubacsi(3) - Castiblanco | 6-3 6-77 6-3 |
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| Fed Cup Group I Clay | Apr 23 2006 |
| | Maria-Fernanda Alves-bra - Castiblanco | 6-2 6-1 |
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| Mazatlan $10,000 Hard | May 7 2006 |
| Qual 1 | Castiblanco(3) - Agustina Llaver | 6-2 6-4 |
| Qual 2 | Castiblanco(3) - Karla Gallardo | 6-0 6-0 |
| 1 | Castiblanco-Q - Paola Iovino-Q | 6-2 6-2 |
| 2 | Andrea Koch-Benvenuto(3) - Castiblanco-Q | 6-2 6-2 |
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| Los Mochis $10,000 Clay | May 14 2006 |
| Qual 1 | Castiblanco(2) | bye |
| Qual 2 | Castiblanco(2) - Efrat Mishor | 6-3 4-6 6-3 |
| 1 | Mariana Duque-Marino(6) - Castiblanco-Q | 6-2 3-0 |
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| Obregon $10,000 Hard | May 21 2006 |
| 1 | Vanesa Furlanetto - Castiblanco | 3-6 7-63 7-64 |
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| Monterrey $10,000 Hard | May 28 2006 |
| Qual 1 | Castiblanco(2) - Anna Anikanova | 1-6 6-3 6-1 |
| Qual 2 | Castiblanco(2) - Jessica Weyreuter(14) | 6-2 5-7 6-4 |
| 1 | Castiblanco-Q - Susanna Lingman-Q | 6-2 4-6 7-5 |
| 2 | Castiblanco-Q - Vanesa Furlanetto | 6-4 6-2 |
| QF | Betina Jozami-Q - Castiblanco-Q | 6-3 6-0 |
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| Leon $10,000 Hard | Jun 4 2006 |
| 1 | Mariana Duque-Marino(3) - Castiblanco | 6-1 6-3 |
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| Jalapa $10,000 Hard | Jun 11 2006 |
| 1 | Veronica Ruo-Qi Li - Castiblanco | 3-6 6-2 6-3 |
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| Valencia $10,000 Hard | Jul 9 2006 |
| 1 | Gabriela Velasco Andreu(6) - Castiblanco | 6-3 6-0 |
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| Caracas $10,000 Hard | Jul 16 2006 |
| 1 | Amber Liu - Castiblanco | 6-1 6-3 |
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| Quito $10,000 Clay | Aug 13 2006 |
| 1 | Castiblanco(8) - Andrea Pazmino-Q | 6-1 6-0 |
| 2 | Castiblanco(8) - Mariana Muci | 6-4 6-4 |
| QF | Jesica Orselli(4) - Castiblanco(8) | 6-2 6-4 |
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| Guayaquil $10,000 Hard | Aug 20 2006 |
| 1 | Estefania Craciun(1) - Castiblanco | 6-2 6-3 |
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| Bogota $10,000 Clay | Aug 27 2006 |
| 1 | Viky Nunez Fuentes(8) - Castiblanco | 7-5 6-2 |
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| Bogota $10,000 Clay | Sep 3 2006 |
| 1 | Nataly Yoo-Q - Castiblanco | 6-4 5-7 7-66 |
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| Caracas $10,000 Hard | Sep 10 2006 |
| 1 | Florencia Molinero(4) - Castiblanco | 6-2 6-4 |
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| Caracas $10,000 Clay | Sep 17 2006 |
| 1 | Jodi Kenoyer-Q - Castiblanco(6) | 6-2 6-2 |
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| Tucuman $10,000 Clay | Oct 8 2006 |
| 1 | Castiblanco - Larissa Ferreira-Q | 6-4 7-5 |
| 2 | Jesica Orselli(2) - Castiblanco | 4-6 6-4 6-3 |
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| Cordoba $10,000 Clay | Oct 15 2006 |
| 1 | Castiblanco - Gabriela Roux-Q | 7-64 2-6 6-2 |
| 2 | Catalina Arancibia - Castiblanco | 6-0 6-0 |
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| Santiago $10,000 Clay | Oct 22 2006 |
| 1 | Castiblanco(6) - Emilia Yorio-Q | 6-3 7-63 |
| 2 | Mailen Auroux-Q - Castiblanco(6) | 7-5 4-6 6-3 |
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| Luque $10,000 Clay | Oct 29 2006 |
| 1 | Castiblanco - Guillermina Zukerman-Q | 7-65 6-4 |
| 2 | Vivian Segnini(5) - Castiblanco | 6-1 6-2 |
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| Santa Cruz $25,000 Clay | Nov 5 2006 |
| 1 | Castiblanco - Mariana Muci | 1-6 6-1 6-4 |
| 2 | Hana Sromova(1) - Castiblanco | 6-1 6-2 |
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| Itajai $10,000 Clay | Nov 12 2006 |
| 1 | Vivian Segnini(5) - Castiblanco | 7-64 6-0 |
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| Florianopolis $10,000 Clay | Nov 19 2006 |
| 1 | Castiblanco - Andrea Koch-Benvenuto(2) | 6-4 6-4 |
| 2 | Castiblanco - Maria Sol Rotondo-Q | 3-6 6-2 6-4 |
| QF | Fernanda Hermenegildo - Castiblanco | 6-4 6-1 |
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| Cordoba $10,000 Clay | Nov 26 2006 |
| 1 | Carla Beltrami-Q - Castiblanco(7) | 6-4 6-1 |