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| Caracas $10,000 Hard | Nov 2 2003 |
| Qual 1 | Gabriela Ziliotto - Masalles | 6-2 6-0 |
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| Valencia $10,000 Hard | Oct 26 2003 |
| Qual 1 | Astrid Besser - Masalles | 7-5 7-5 |
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| Santo Domingo $10,000 Hard | Oct 19 2003 |
| QF | Flavia Mignola(6) - Masalles | 6-0 6-4 |
| 2 | Masalles - Leticia Sobral(1) | walkover |
| 1 | Masalles - Michelle Aybar-WC | 6-1 6-0 |
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| Fed Cup Hard | Apr 26 2003 |
| | Masalles - Julia Roca Valverde-crc | 6-4 6-2 |
| | Estefania Balda-ecu - Masalles | 6-1 6-1 |
| | Avel Romaly Coronado-ven - Masalles | 6-4 6-2 |
| | Kristina Brandi-pur - Masalles | 6-0 6-0 |
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| Santo Domingo $10,000 | Sep 22 2002 |
| 1 | Micaela Moran(4) - Masalles-WC | 6-1 6-2 |
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| | No grand slam results for Vanessa Masalles |
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| Win/loss | Clay | Hard | Carpet | Grass | Total |
| Since 1994 | 0/0 | 3/6 | 0/0 | 0/0 | 4/8 |
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