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| Fullerton $50,000 Hard | Jan 26 2003 |
| Qual 1 | Casoni - Petra Russegger(7) | 6-1 6-3 |
| Qual 2 | Casoni - Lourdes Dominguez Lino | 6-1 6-1 |
| Qual 3 | Casoni - Julia Schruff(3) | 6-3 6-1 |
| 1 | Evelyn Fauth - Casoni-Q | 6-2 6-3 |
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| Rockford $25,000 Hard | Feb 2 2003 |
| Qual 1 | Casoni - Valentina Sassi(6) | 6-4 6-1 |
| Qual 2 | Casoni - Kristen Schlukebir(12) | 6-4 4-6 6-2 |
| 1 | Conchita Martinez-Granados(1) - Casoni-Q | 7-5 4-6 6-2 |
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| Midland $75,000 Hard | Feb 9 2003 |
| Qual 1 | Casoni - Leanne Baker | 7-5 6-2 |
| Qual 2 | Casoni - Ivana Abramovic | 6-3 4-6 6-2 |
| Qual 3 | Bianka Lamade(4) - Casoni | 6-74 6-3 7-5 |
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| Southampton $25,000 Hard | Feb 16 2003 |
| Qual 1 | Casoni(12) - Olivia Sanchez | 6-1 4-6 7-5 |
| Qual 2 | Casoni(12) - Laura Dell'Angelo(8) | 6-2 6-3 |
| 1 | Casoni-Q - Jarmila Gajdosova | 6-4 1-6 7-5 |
| 2 | Casoni-Q - Dessislava Topalova | 7-66 6-2 |
| QF | Casoni-Q - Olga Barabanschikova(2) | 6-3 6-2 |
| SF | Karolina Sprem-Q - Casoni-Q | 6-2 6-1 |
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| Redbridge $25,000 Hard | Feb 23 2003 |
| Qual 1 | Casoni - Jana Hlavackova(4) | 6-3 6-2 |
| Qual 2 | Casoni - Lydia Steinbach | 6-1 6-1 |
| 1 | Julie Pullin(8) - Casoni-Q | 6-3 6-72 6-3 |
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| Coatzacoalcos $25,000 Hard | Apr 13 2003 |
| 1 | Casoni(8) - Lana Popadic | 6-4 6-2 |
| 2 | Kildine Chevalier-Q - Casoni(8) | 6-4 6-4 |
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| San Luis Potosi $25,000 Clay | Apr 20 2003 |
| 1 | Casoni - Melisa Arevalo | 6-2 6-0 |
| 2 | Casoni - Zuzana Hejdova(4) | 6-3 6-0 |
| QF | Lana Popadic - Casoni | 6-75 7-61 7-66 |
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| Dothan $75,000 Clay | Apr 27 2003 |
| Qual 1 | Jana Hlavackova(5) - Casoni | 7-62 6-2 |
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| Gifu $50,000 Grass | May 4 2003 |
| 1 | Casoni - Jie Zheng(7) | 3-6 6-3 7-64 |
| 2 | Rika Fujiwara - Casoni | 7-63 7-63 |
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| Fukuoka $50,000 Clay | May 11 2003 |
| 1 | Maika Ozaki-WC - Casoni | 6-4 6-4 |
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| Madrid Tier III Clay | May 25 2003 |
| Qual 1 | Casoni - Alexandra Recio-WC | 6-2 6-0 |
| Qual 2 | Oleksandra Kravets - Casoni | 2-6 6-1 6-2 |
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| Galatina $25,000 Clay | Jun 8 2003 |
| Qual 1 | Casoni(5) | bye |
| Qual 2 | Casoni(5) - Sabrina Eisenberg | 6-0 6-1 |
| Qual 3 | Casoni(5) - Silvia Disderi(14) | 6-4 6-1 |
| 1 | Sofia Arvidsson(5) - Casoni-Q | 6-3 6-4 |
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| Grado $25,000 Clay | Jun 15 2003 |
| 1 | Casoni - Oana Elena Golimbioschi-Q | 6-1 6-4 |
| 2 | Casoni - Alice Canepa | 6-4 3-6 7-65 |
| QF | Catalina Castano(5) - Casoni | 2-6 6-1 6-1 |
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| Gorizia $25,000 Clay | Jun 22 2003 |
| 1 | Catalina Castano(6) - Casoni | 7-5 6-4 |
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| Fontanafredda $25,000 Clay | Jun 29 2003 |
| 1 | Casoni - Alice Canepa | 6-2 6-4 |
| 2 | Alona Bondarenko(2) - Casoni | 7-64 6-3 |
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| Orbetello $50,000 Clay | Jul 6 2003 |
| 1 | Eva Fislova - Casoni-WC | 6-4 7-5 |
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| Palermo Tier V Clay | Jul 13 2003 |
| Qual 1 | Renata Voracova(3) - Casoni | 6-1 6-2 |
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| Modena $50,000 Clay | Jul 20 2003 |
| Qual 1 | Valentina Sassi - Casoni(3) | 6-3 6-74 6-0 |
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| Les Contamines $25,000 Hard | Jul 27 2003 |
| 1 | Casoni - Christina Fitz-Q | 7-5 3-6 6-1 |
| 2 | Nathalie Vierin(1) - Casoni | 7-5 6-1 |
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| Cuneo $50,000 Clay | Aug 10 2003 |
| 1 | Casoni - Zsofia Gubacsi | 7-65 4-6 6-3 |
| 2 | Casoni - Galina Voskoboeva | walkover |
| QF | Lubomira Bacheva - Casoni | 6-1 6-1 |
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| Martina Franca $25,000 Clay | Aug 17 2003 |
| 1 | Kildine Chevalier - Casoni(3) | 6-0 6-2 |
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| Rimini $25,000 Clay | Aug 31 2003 |
| 1 | Lourdes Dominguez Lino-Q - Casoni | 3-6 6-3 6-3 |
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| US Open Hard | Sep 7 2003 |
| Qual 1 | Evelyn Fauth - Casoni | 4-6 6-1 6-2 |
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| Fano $50,000 Clay | Sep 7 2003 |
| 1 | Sandra Kloesel - Casoni-WC | 6-1 6-4 |
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| Biella $50,000 Clay | Sep 28 2003 |
| 1 | Conchita Martinez-Granados - Casoni | 6-4 4-6 6-3 |
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| Caserta $25,000 Clay | Oct 5 2003 |
| 1 | Casoni(7) - Valentina Sulpizio-Q | 6-2 6-1 |
| 2 | Casoni(7) - Elisa Balsamo-Q | 3-6 6-3 6-2 |
| QF | Mervana Jugic-Salkic(2) - Casoni(7) | 6-4 6-4 |
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| Latina $50,000 Clay | Oct 12 2003 |
| 1 | Casoni - Zuzana Hejdova-LL | 6-1 2-6 6-3 |
| 2 | Dally Randriantefy(5) - Casoni | 5-7 6-4 6-2 |
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| Cardiff $25,000 Hard | Oct 19 2003 |
| 1 | Casoni(7) - Dragana Zaric | 6-3 4-6 6-3 |
| 2 | Sarah Borwell-Q - Casoni(7) | 6-4 2-6 6-3 |