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| Cali $100,000 Clay | Feb 13 2011 |
| 1 | Xinyun Han - Castiblanco | 6-1 6-1 |
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| Bogota International Clay | Feb 20 2011 |
| Qual 1 | Maria Irigoyen - Castiblanco | 6-2 6-0 |
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| Irapuato $25,000 Hard | Mar 13 2011 |
| Qual 1 | Adriana Perez - Castiblanco(16) | 6-2 6-4 |
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| Metepec $10,000 Hard | Mar 20 2011 |
| 1 | Castiblanco - Macall Harkins | 5-7 6-2 6-2 |
| 2 | Castiblanco - Ksenia Lykina(8) | 6-3 2-6 6-2 |
| QF | Castiblanco - Romana Tedjakusuma | 6-1 6-3 |
| SF | Amanda Fink(6) - Castiblanco | 6-1 6-75 6-1 |
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| Buenos Aires $25,000 Clay | Apr 3 2011 |
| 1 | Maria Fernanda Alvarez Teran(8) - Castiblanco | 7-61 6-3 |
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| Caracas $10,000 Hard | Apr 10 2011 |
| 1 | Castiblanco(2) - Gabriela Coglitore | 6-2 6-1 |
| 2 | Castiblanco(2) - Yasmine Guimaraes | 6-3 6-1 |
| QF | Viktoryia Kisialeva - Castiblanco(2) | 6-1 6-2 |
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| Caracas $10,000 Hard | Apr 17 2011 |
| 1 | Castiblanco(4) - Kyung Yee Chae | 6-2 6-1 |
| 2 | Castiblanco(4) - Jessica Sabeshinskaja | 6-2 6-1 |
| QF | Adriana Perez(6) - Castiblanco(4) | 4-6 6-0 6-2 |
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| Caracas $10,000 Hard | Apr 24 2011 |
| 1 | Castiblanco(3) - Maria Andrea Cardenas | 6-1 6-1 |
| 2 | Castiblanco(3) - Steffi Distelmans | 6-1 6-4 |
| QF | Castiblanco(3) - Anastasia Kharchenko(6) | 6-2 6-4 |
| SF | Indire Akiki - Castiblanco(3) | 6-3 6-3 |
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| Brescia $25,000 Clay | May 22 2011 |
| Qual 1 | Castiblanco(6) - Monica Cantele | 6-2 6-1 |
| Qual 2 | Silvia Njiric(12) - Castiblanco(6) | 6-3 6-2 |
| 1 | Castiblanco - Isabella Holland(5) | 5-7 6-3 6-4 |
| 2 | Monica Puig - Castiblanco | 6-3 6-0 |
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| Grado $25,000 Clay | May 29 2011 |
| Qual 1 | Castiblanco(16) - Eleonora Cecchinato | 6-1 6-0 |
| Qual 2 | Isabella Holland(1) - Castiblanco(16) | 6-3 5-7 6-1 |
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| Maribor $25,000 Clay | Jun 5 2011 |
| Qual 1 | Castiblanco(4) | bye |
| Qual 2 | Castiblanco(4) - Barbara Bonic | 2-6 6-4 6-3 |
| Qual 3 | Milana Spremo(13) - Castiblanco(4) | 6-3 6-2 |
| 1 | Ani Mijacika - Castiblanco | 7-65 6-4 |
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| Campobasso $25,000 Clay | Jun 12 2011 |
| Qual 1 | Castiblanco(2) | bye |
| Qual 2 | Castiblanco(2) - Francesca Palmigiano(13) | 6-1 6-76 6-3 |
| 1 | Fernanda Hermenegildo - Castiblanco | 7-63 6-3 |
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| Padova $25,000 Clay | Jun 19 2011 |
| Qual 1 | Castiblanco(4) - Alessia Bertoia | 6-0 6-3 |
| Qual 2 | Erika Zanchetta(16) - Castiblanco(4) | 6-2 6-75 6-4 |
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| Rome - Tevere Remo $25,000 Clay | Jun 26 2011 |
| Qual 1 | Castiblanco(4) - Caterina Ghedin | 6-4 6-1 |
| Qual 2 | Chiara Pappacena - Castiblanco(4) | 6-3 6-2 |
| 1 | Kristina Mladenovic - Castiblanco | 6-3 6-3 |
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| Middelburg $25,000 Clay | Jul 3 2011 |
| 1 | Audrey Bergot(4) - Castiblanco | 6-4 6-2 |
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| Bogota $25,000 Clay | Jul 17 2011 |
| 1 | Castiblanco(7) - Laura Sofia Sanchez Perez | 6-0 6-0 |
| 2 | Castiblanco(7) - Andrea Prisco | 6-2 7-5 |
| QF | Sachia Vickery - Castiblanco(7) | 6-3 3-6 6-2 |
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| Campos do Jordao $25,000 Hard | Jul 31 2011 |
| 1 | Castiblanco - Beatriz Haddad Maia | 6-2 6-3 |
| 2 | Andrea Koch-Benvenuto(7) - Castiblanco | 6-1 6-2 |
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| Sao Paulo $10,000 Clay | Aug 7 2011 |
| 1 | Castiblanco(4) - Gabriela Ce | 6-4 6-1 |
| 2 | Beatriz Haddad Maia - Castiblanco(4) | 6-3 6-74 7-61 |
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| Alphen a/d Rijn $25,000 Clay | Sep 11 2011 |
| Qual 1 | Josanne Van Bennekom - Castiblanco(5) | 6-1 6-4 |
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| Rotterdam $25,000 Clay | Sep 18 2011 |
| 1 | Castiblanco - Adriana Perez | 5-7 6-4 6-3 |
| 2 | Lina Stanciute(4) - Castiblanco | 6-1 6-1 |
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| Foggia $25,000 Clay | Sep 25 2011 |
| Qual 1 | Castiblanco(6) | bye |
| Qual 2 | Castiblanco(6) - Anna Zaja(14) | 7-5 6-3 |
| 1 | Angelica Moratelli - Castiblanco | 6-3 6-1 |
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| Clermont-Ferrand $25,000 Hard | Oct 2 2011 |
| Qual 1 | Castiblanco(5) - Manon Arnaud | 6-3 2-6 6-3 |
| Qual 2 | Nadezda Gorbachkova(16) - Castiblanco(5) | 6-2 7-5 |
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| Madrid $10,000 Hard | Oct 9 2011 |
| 1 | Castiblanco(4) - Tamara Alvarez-Riobo | 6-4 6-3 |
| 2 | Stefania Fadabini - Castiblanco(4) | 4-6 6-3 6-4 |
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| Bogota $10,000 Clay | Oct 30 2011 |
| 1 | Castiblanco(1) - Deborah Suarez | 6-2 6-3 |
| 2 | Castiblanco(1) - Karine Celis | 6-1 6-1 |
| QF | Castiblanco(1) - Libby Muma(7) | 6-3 6-2 |
| SF | Cecilia Costa Melgar(3) - Castiblanco(1) | 7-5 6-2 |
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| Bogota $10,000 Clay | Nov 6 2011 |
| 1 | Castiblanco(2) - Alina Mikheeva | 6-1 6-1 |
| 2 | Castiblanco(2) - Marcela Gomez | 6-1 6-1 |
| QF | Castiblanco(2) - Martina Frantova | 6-3 7-63 |
| SF | Castiblanco(2) - Maria Paulina Perez Garcia | 6-1 6-1 |
| F | Yuliana Lizarazo(1) - Castiblanco(2) | 4-6 7-5 6-4 |
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| Asuncion $25,000 Clay | Nov 20 2011 |
| 1 | Ulrikke Eikeri - Castiblanco | 6-2 6-1 |
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| Rosario $25,000 Clay | Dec 4 2011 |
| Qual 1 | Castiblanco(4) | bye |
| Qual 2 | Castiblanco(4) - Raquel Piltcher | 7-5 6-2 |
| Qual 3 | Castiblanco(4) - Carla Forte(13) | 7-5 6-1 |
| 1 | Castiblanco - Catalina Pella | walkover |
| 2 | Veronica Cepede (4) - Castiblanco | 7-5 6-2 |
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| Buenos Aires $25,000 Clay | Dec 11 2011 |
| Qual 1 | Castiblanco(5) | bye |
| Qual 2 | Gabriela Ce - Castiblanco(5) | 6-3 6-2 |
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| Santiago $25,000 Clay | Dec 18 2011 |
| 1 | Castiblanco - Katerina Kramperova | 6-3 6-3 |
| 2 | Ines Ferrer Suarez(5) - Castiblanco | 6-2 6-0 |