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| Tallahassee $10,000 Hard | Jan 12 2003 |
| 1 | Marois(4) - Ryoko Takemura | 6-3 6-3 |
| 2 | Marois(4) - Chantal Coombs | 6-3 6-4 |
| QF | Marois(4) - Vladimira Uhlirova | 6-2 6-2 |
| SF | Marois(4) - Lioudmila Skavronskaia(2) | 6-4 6-1 |
| F | Jana Nejedly(1) - Marois(4) | 6-4 6-0 |
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| Boca Raton $10,000 Hard | Jan 19 2003 |
| 1 | Maria Kirilenko - Marois | 6-0 6-3 |
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| Miami $10,000 Hard | Jan 26 2003 |
| 1 | Olga Puchkova-Q - Marois(2) | 6-1 6-2 |
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| Rockford $25,000 Hard | Feb 2 2003 |
| Qual 1 | Marois(14) - Cory Ann Avants | 6-4 6-2 |
| Qual 2 | Ivana Abramovic(8) - Marois(14) | 6-0 6-2 |
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| Bogota Tier III Clay | Feb 23 2003 |
| Qual 1 | Marois(4) - Catalina Villegas-Garcia | 6-1 6-1 |
| Qual 2 | Marois(4) - Gabriela Velasco Andreu | 6-3 6-3 |
| Qual 3 | Marois(4) - Rosa Maria Sitja(7) | 6-4 5-7 6-4 |
| 1 | Katalin Marosi - Marois-Q | 6-1 6-4 |
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| Acapulco Tier III Clay | Mar 2 2003 |
| Qual 1 | Paula Garcia - Marois | 7-5 7-5 |
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| St. Petersburg $25,000 Hard | Mar 30 2003 |
| 1 | Marois - Alberta Brianti | 6-3 7-64 |
| 2 | Marois - Galina Fokina(1) | 6-4 6-4 |
| QF | Galina Voskoboeva - Marois | 6-4 2-6 6-1 |
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| Coatzacoalcos $25,000 Hard | Apr 13 2003 |
| 1 | Marois - Nora Quintal-WC | 6-2 6-2 |
| 2 | Marois - Alyssa Cohen-Q | 0-6 6-2 7-5 |
| QF | Maria Elena Camerin(2) - Marois | 6-2 6-4 |
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| San Luis Potosi $25,000 Clay | Apr 20 2003 |
| 1 | Marois - Karin Palme-WC | 6-3 6-73 6-3 |
| 2 | Vanessa Webb(1) - Marois | 6-1 6-2 |
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| Dothan $75,000 Clay | Apr 27 2003 |
| Qual 1 | Marois(9) - Joanne Moore | 6-0 6-4 |
| Qual 2 | Shikha Uberoi-WC - Marois(9) | 6-3 6-4 |
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| Sea Island $25,000 Clay | May 11 2003 |
| 1 | Shuai Peng-Q - Marois | 0-6 6-2 6-3 |
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| Charlottesville $25,000 Clay | May 18 2003 |
| 1 | Marois - Maria-Fernanda Alves(8) | 6-4 6-3 |
| 2 | Ally Baker - Marois | 6-2 7-65 |
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| Hilton Head $10,000 Hard | Jun 8 2003 |
| 1 | Marois(1) - Mayumi Yamamoto-Q | 4-6 6-2 6-2 |
| 2 | Marois(1) - Anzela Zguna | 6-2 6-4 |
| QF | Marois(1) - Allison Bradshaw(5) | 6-4 4-6 6-0 |
| SF | Ludmila Richterova-Q - Marois(1) | 6-2 3-6 6-1 |
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| Hamilton $25,000 Clay | Jun 15 2003 |
| 1 | Marois(3) - Robin Stephenson-Q | 4-6 6-4 6-4 |
| 2 | Marois(3) - Ioana Plesu | 2-6 6-2 6-3 |
| QF | Verena Beller(7) - Marois(3) | 6-2 6-0 |
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| Dallas $10,000 Hard | Jun 22 2003 |
| 1 | Marois(1) - Kokoro Takehara | 6-2 6-2 |
| 2 | Mayumi Yamamoto-Q - Marois(1) | 6-4 7-5 |
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| Los Gatos $50,000 Hard | Jul 6 2003 |
| 1 | Marois - Diana Ospina | 2-6 6-4 7-65 |
| 2 | Marois - Kelly Liggan(5) | 6-4 7-5 |
| QF | Shenay Perry(4) - Marois | 6-2 6-1 |
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| Vancouver $25,000 Hard | Jul 13 2003 |
| 1 | Marois(3) - Monika Dancevic-WC | 6-2 6-1 |
| 2 | Marois(3) - Stephanie Dubois-WC | 6-2 6-4 |
| QF | Marois(3) - Verena Beller | 6-4 6-1 |
| SF | Anna-Lena Groenefeld(1) - Marois(3) | 6-74 6-3 6-2 |
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| Oyster Bay $50,000 Hard | Jul 20 2003 |
| 1 | Christina Wheeler - Marois | 6-0 6-75 6-4 |
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| Lexington $50,000 Hard | Jul 27 2003 |
| 1 | Samantha Stosur(7) - Marois | 6-4 7-64 |
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| Louisville $50,000 Hard | Aug 3 2003 |
| Qual 1 | Marois - Jewel Peterson-WC | 4-6 6-3 6-1 |
| Qual 2 | Marois - Kristen Schlukebir | 7-5 6-3 |
| Qual 3 | Jessica Lehnhoff - Marois | 6-3 6-3 |
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| Toronto Tier I Hard | Aug 17 2003 |
| 1 | Emilie Loit - Marois-WC | 6-4 6-75 6-2 |
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| Peachtree City $25,000 Hard | Sep 14 2003 |
| 1 | Marois - Megan Falcon-WC | 6-0 6-2 |
| 2 | Rika Fujiwara - Marois | 6-0 6-1 |
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| Columbus $50,000 Hard | Sep 21 2003 |
| Qual 1 | Marois(8) - Andrea Van Den Hurk | 6-2 6-2 |
| Qual 2 | Ally Baker - Marois(8) | 6-3 6-4 |
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| Albuquerque $75,000 Hard | Sep 28 2003 |
| Qual 1 | Marois(1) - Kaysie Smashey | 6-4 3-6 6-2 |
| Qual 2 | Marois(1) - Ana Lucia Migliarini De Leon | 6-2 6-4 |
| Qual 3 | Vilmarie Castellvi - Marois(1) | 6-2 6-1 |
| 1 | Tara Snyder - Marois-LL | 6-4 6-4 |
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| Troy $50,000 Hard | Oct 5 2003 |
| 1 | Marois - Jessica Fernandez-Q | 6-3 6-2 |
| 2 | Marois - Allison Bradshaw-WC | 7-5 6-4 |
| QF | Natalie Grandin - Marois | 6-3 2-6 6-1 |
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| Mexico City $25,000 Hard | Oct 19 2003 |
| 1 | Marois(6) - Amber Liu | 6-4 6-2 |
| 2 | Vilmarie Castellvi-Q - Marois(6) | 6-2 2-6 6-3 |
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| Quebec City Tier III Hard | Nov 2 2003 |
| 1 | Jie Zheng - Marois-WC | 6-2 6-0 |
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| Pittsburgh $50,000 Hard | Nov 9 2003 |
| Qual 1 | Sunitha Rao(8) - Marois | 7-5 7-66 |
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| Eugene $50,000 Hard | Nov 16 2003 |
| Qual 1 | Marois(6) - Jennifer Russell | 6-2 6-2 |
| Qual 2 | Marois(6) - Shikha Uberoi | 6-3 6-1 |
| Qual 3 | Kristen Schlukebir - Marois(6) | 6-3 4-6 6-2 |