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| Lareda $10,000 Hard | Mar 9 2003 |
| Qual 1 | Coassolo - Anna Powaska | 6-3 6-3 |
| Qual 2 | Michelle Summerside(7) - Coassolo | 4-6 7-5 6-1 |
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| Matamoros $10,000 Clay | Mar 16 2003 |
| Qual 1 | Coassolo - Alejandra Obregon | 2-6 6-2 6-1 |
| Qual 2 | Coassolo - Melissa Berry(3) | 6-1 6-3 |
| 1 | Erica Biro-Q - Coassolo-Q | 6-0 6-2 |
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| Monterrey $10,000 Clay | Mar 23 2003 |
| Qual 1 | Anastasia Dvornikova - Coassolo | 6-4 6-1 |
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| Coatzacoalcos $25,000 Hard | Apr 13 2003 |
| Qual 1 | Giorgia Mortello(2) - Coassolo | 6-3 6-2 |
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| San Luis Potosi $25,000 Clay | Apr 20 2003 |
| Qual 1 | Ana Cecilia Olivos - Coassolo(16) | 6-4 6-4 |
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| Poza Rica $10,000 Hard | Jun 22 2003 |
| 1 | Coassolo - Naoko Horikawa | 6-76 6-3 6-3 |
| 2 | Carla Tiene(2) - Coassolo | 6-2 6-2 |
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| CD. Victoria $10,000 Hard | Jun 29 2003 |
| 1 | Coassolo - Erika Clarke | 6-3 6-4 |
| 2 | Carla Tiene(2) - Coassolo | 6-3 6-1 |
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| Monterrey $10,000 Hard | Jul 6 2003 |
| 1 | Coassolo - Sheila Guerberg | 6-2 5-7 6-4 |
| 2 | Daniela Munoz Gallegos(4) - Coassolo | 6-73 6-1 7-63 |
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| Puerto Ordaz $10,000 Hard | Jul 20 2003 |
| 1 | Jacquelyn Rosen(1) - Coassolo | 6-2 7-63 |
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| Puerto Ordaz $10,000 Hard | Jul 27 2003 |
| 1 | Soledad Esperon - Coassolo(6) | 6-3 0-6 6-2 |
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| Manta $10,000 Hard | Aug 3 2003 |
| 1 | Virginia Donda-Q - Coassolo(2) | 6-3 6-2 |
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| La Paz $10,000 Clay | Aug 24 2003 |
| 1 | Andrea Hofinger - Coassolo(7) | 6-3 7-5 |
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| Parana $10,000 Clay | Aug 31 2003 |
| 1 | Coassolo - Hilda Zuleta-Q | 6-3 7-5 |
| 2 | Leticia Sobral(4) - Coassolo | 3-6 6-1 6-4 |
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| Asuncion $10,000 Hard | Sep 7 2003 |
| 1 | Coassolo - Sabrina Eisenberg(7) | 1-6 6-4 6-4 |
| 2 | Coassolo - Flavia Mignola | 6-4 7-5 |
| QF | Jorgelina Cravero(1) - Coassolo | 6-2 6-4 |
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| Santiago $10,000 Clay | Sep 14 2003 |
| 1 | Coassolo - Marina Cardoso | 6-0 6-3 |
| 2 | Florencia Salvadores(6) - Coassolo | 6-0 6-4 |
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| Guadalajara $10,000 Clay | Oct 5 2003 |
| 1 | Melissa Torres Sandoval - Coassolo | 6-0 4-6 6-2 |
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| CD. Juarez $50,000 Clay | Oct 12 2003 |
| Qual 1 | Karin Palme - Coassolo | 7-62 6-2 |
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| Mexico City $25,000 Hard | Oct 19 2003 |
| Qual 1 | Amanda Augustus(9) - Coassolo | 7-62 6-710 6-1 |
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| Obregon $10,000 Clay | Nov 2 2003 |
| 1 | Coassolo - Ariela Perez | 0-6 6-2 7-60 |
| 2 | Daniela Munoz Gallegos(5) - Coassolo | 6-2 6-0 |
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| Los Mochis $10,000 Clay | Nov 9 2003 |
| 1 | Melisa Arevalo(8) - Coassolo | 6-0 7-61 |
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| Mexico City $10,000 Hard | Nov 16 2003 |
| Qual 1 | Coassolo(13) - Ana Cecilia Trevino | 4-6 6-4 6-3 |
| Qual 2 | Melisa Arevalo(3) - Coassolo(13) | 6-3 6-4 |
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| Puebla $25,000 Hard | Nov 23 2003 |
| Qual 1 | Coassolo - Melisa Arevalo(15) | 6-3 6-4 |
| Qual 2 | Larissa Carvalho(5) - Coassolo | 6-4 6-3 |