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| Tallahassee $10,000 Hard | Jan 12 2003 |
| Qual 1 | Zguna(6) | bye |
| Qual 2 | Zguna(6) - Ashley Bentley | 7-5 6-1 |
| Qual 3 | Zguna(6) - Maren Haus | 6-4 6-2 |
| Qual 4 | Jessica Kirkland - Zguna(6) | 6-2 6-2 |
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| Boca Raton $10,000 Hard | Jan 19 2003 |
| Qual 1 | Zguna - Arpi Kojian | 6-3 6-4 |
| Qual 2 | Zguna - Marnie Mahler(12) | 7-5 6-0 |
| Qual 3 | Antonia Matic(6) - Zguna | 6-4 3-6 6-0 |
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| Miami $10,000 Hard | Jan 26 2003 |
| Qual 1 | Zguna(12) - Judit Trunkos | 6-1 6-2 |
| Qual 2 | Zguna(12) - Diane Cheymol-WC | 6-0 6-3 |
| Qual 3 | Zguna(12) - Megan Moulton-Levy-WC | 6-4 6-1 |
| 1 | Zguna-Q - Petra Rampre(7) | 6-2 6-3 |
| 2 | Zguna-Q - Shadisha Robinson | 6-4 6-3 |
| QF | Zguna-Q - Lioudmila Skavronskaia(1) | 7-63 6-4 |
| SF | Zguna-Q - Bruna Colosio(4) | 6-4 6-2 |
| F | Zguna-Q - Olga Puchkova-Q | 6-4 6-2 |
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| Jackson $25,000 Clay | Apr 20 2003 |
| Qual 1 | Zguna - Beier Ko(6) | 2-6 6-4 7-5 |
| Qual 2 | Zguna - Milangela Morales(9) | 6-4 6-2 |
| 1 | Angela Haynes-Q - Zguna-Q | 6-4 6-1 |
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| Sea Island $25,000 Clay | May 11 2003 |
| Qual 1 | Zguna - Joana Cortez(8) | 6-4 6-4 |
| Qual 2 | Allison Bradshaw(13) - Zguna | 6-3 7-62 |
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| Charlottesville $25,000 Clay | May 18 2003 |
| Qual 1 | Zguna - Angela Haynes(15) | 6-3 6-3 |
| Qual 2 | Alyssa Cohen(3) - Zguna | 6-4 6-2 |
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| El Paso $10,000 Hard | May 25 2003 |
| 1 | Angela Haynes - Zguna | 6-4 6-2 |
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| Houston $10,000 Hard | Jun 1 2003 |
| Qual 1 | Zguna(2) - Riza Zalameda | 6-1 6-2 |
| Qual 2 | Zguna(2) - Lia Jackson | 6-0 6-1 |
| Qual 3 | Zguna(2) - Stephanie Kusano | 7-5 6-1 |
| 1 | Nicole Rencken(3) - Zguna-Q | 7-65 6-0 |
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| Hilton Head $10,000 Hard | Jun 8 2003 |
| 1 | Zguna - Marcela Evangelista | 7-5 6-4 |
| 2 | Melanie Marois(1) - Zguna | 6-2 6-4 |
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| Allentown $25,000 Hard | Jun 15 2003 |
| Qual 1 | Zguna(6) - Jessyca Arthur | 6-3 6-3 |
| Qual 2 | Zguna(6) - Elizabeth Kobak | 7-5 6-0 |
| 1 | Adria Engel-Q - Zguna-Q | 2-6 6-3 6-2 |
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| Dallas $10,000 Hard | Jun 22 2003 |
| 1 | Zguna - Alanna Broderick-Q | 4-6 6-4 6-2 |
| 2 | Zguna - Paula Zabala | 6-4 6-2 |
| QF | Vilmarie Castellvi-Q - Zguna | 7-5 0-6 6-3 |
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| Edmond $10,000 Hard | Jun 29 2003 |
| 1 | Zguna - Amber Liu(8) | 6-1 6-3 |
| 2 | Zguna - Whitney Deason-Q | 6-1 6-3 |
| QF | Zguna - Stephanie Hazlett-Q | 6-4 6-3 |
| SF | Kyung-Mi Chang(4) - Zguna | 6-4 6-4 |
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| Los Gatos $50,000 Hard | Jul 6 2003 |
| Qual 1 | Lauren Kalvaria(8) - Zguna | 6-3 6-2 |
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| Lexington $50,000 Hard | Jul 27 2003 |
| Qual 1 | Lioudmila Skavronskaia - Zguna | 6-2 4-6 6-3 |
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| Peachtree City $25,000 Hard | Sep 14 2003 |
| Qual 1 | Sania Mirza(14) - Zguna | 7-5 6-3 |
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| Columbus $50,000 Hard | Sep 21 2003 |
| Qual 1 | Zguna - Joanne Moore | 6-3 4-6 7-5 |
| Qual 2 | Jennifer Hopkins(1) - Zguna | 6-0 6-3 |
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| Raleigh $25,000 Clay | Sep 28 2003 |
| Qual 1 | Zguna(3) - Marta Simic | 7-63 6-2 |
| Qual 2 | Zguna(3) - Jodi Kenoyer(11) | 7-65 2-6 6-1 |
| 1 | Sarah Riske-Q - Zguna-Q | 6-4 6-3 |
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| Greenville $25,000 Clay | Oct 5 2003 |
| Qual 1 | Zguna(5) | bye |
| Qual 2 | Zguna(5) - Renata Marcinkowska | 6-1 6-3 |
| 1 | Zguna-Q - Erica Biro-Q | 6-1 7-62 |
| 2 | Mariana Diaz-Oliva(1) - Zguna-Q | 6-4 6-0 |
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| Lafayette $25,000 Clay | Oct 12 2003 |
| 1 | Zguna - Mimi Renaudin-WC | 6-0 6-1 |
| 2 | Natalie Grandin(3) - Zguna | 6-4 6-2 |
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| Pittsburgh $50,000 Hard | Nov 9 2003 |
| Qual 1 | Zguna - Kristen Schlukebir | 6-2 2-1 |
| Qual 2 | Carly Gullickson - Zguna | 6-4 7-66 |
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| Eugene $50,000 Hard | Nov 16 2003 |
| Qual 1 | Angelika Bachmann(4) - Zguna | 6-4 6-4 |