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| Auckland Tier IV Hard | Jan 5 2003 |
| 1 | Muller - Leanne Baker-WC | 7-5 4-6 6-2 |
| 2 | Eleni Daniilidou(2) - Muller | 6-3 6-0 |
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| Canberra Tier V Hard | Jan 12 2003 |
| 1 | Anca Barna - Muller | 3-6 6-4 7-66 |
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| Australian Open Hard | Jan 26 2003 |
| 1 | Antonella Serra Zanetti - Muller | 7-65 6-0 |
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| Paris Tier II Hard | Feb 9 2003 |
| Qual 1 | Maria Sanchez Lorenzo - Muller(8) | 6-4 2-6 6-2 |
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| Doha Tier III Hard | Feb 16 2003 |
| 1 | Lucie Ahl-Q - Muller | 7-65 4-6 6-3 |
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| Dubai Tier II Hard | Feb 23 2003 |
| Qual 1 | Yuliana Fedak - Muller(6) | 6-4 6-2 |
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| Acapulco Tier III Clay | Mar 2 2003 |
| 1 | Muller - Asa Svensson | 1-6 6-2 6-4 |
| 2 | Mariana Diaz-Oliva - Muller | 6-1 6-2 |
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| Indian Wells Tier I Hard | Mar 16 2003 |
| 1 | Myriam Casanova - Muller | 6-3 6-4 |
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| Mesa $50,000 Hard | Mar 16 2003 |
| 1 | Tatiana Perebiynis - Muller(5) | 6-0 6-1 |
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| Key Biscayne Tier I Hard | Mar 30 2003 |
| 1 | Marlene Weingartner-Q - Muller | 6-2 7-5 |
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| Casablanca Tier V Clay | Apr 6 2003 |
| 1 | Gala Leon-Garcia-Q - Muller | 6-1 6-2 |
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| Budapest Tier V Clay | Apr 20 2003 |
| 1 | Iveta Benesova - Muller | 6-2 4-6 6-2 |
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| Berlin Tier I Clay | May 11 2003 |
| 1 | Jelena Kostanic Tosic-Q - Muller-WC | 6-4 6-4 |
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| Roland Garros Clay | Jun 8 2003 |
| 1 | Vera Zvonareva(22) - Muller | 6-1 6-3 |
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| Marseille $50,000 Clay | Jun 15 2003 |
| 1 | Marie-Eve Pelletier - Muller(8) | 6-2 6-0 |
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| Wimbledon Grass | Jul 6 2003 |
| Qual 1 | Elena Tatarkova - Muller | 6-0 6-4 |
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| Harrisonburg $10,000 Hard | Aug 3 2003 |
| 1 | Muller(1) - Olga Puchkova | 2-6 7-64 6-3 |
| 2 | Muller(1) - Kim Anh Nguyen-Q | 3-6 6-3 7-61 |
| QF | Muller(1) - Ahsha Rolle | 6-3 6-2 |
| SF | Shikha Uberoi(3) - Muller(1) | 6-4 4-6 7-5 |
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| Bronx $50,000 Hard | Aug 17 2003 |
| Qual 1 | Muller - Ma. Emilia Salerni(2) | 5-7 6-2 6-4 |
| Qual 2 | Cory Ann Avants-WC - Muller | 7-5 6-2 |
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| Rimini $25,000 Clay | Aug 31 2003 |
| 1 | Oleksandra Kravets - Muller(6) | 6-4 6-72 6-1 |
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| US Open Hard | Sep 7 2003 |
| Qual 1 | Selima Sfar - Muller | 7-68 6-0 |
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| Torino $25,000 Clay | Sep 14 2003 |
| 1 | Muller - Giulia Gatto-Monticone-WC | 6-3 6-1 |
| 2 | Rita Kuti Kis - Muller | 6-4 6-0 |
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| Biella $50,000 Clay | Sep 28 2003 |
| 1 | Elise Tamaela-LL - Muller | 6-1 6-3 |
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| Mackay $25,000 Hard | Oct 19 2003 |
| 1 | Stephanie Hazlett-Q - Muller | 6-2 6-0 |
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| Rockhampton $25,000 Hard | Oct 26 2003 |
| 1 | Nina Duebbers(5) - Muller | 6-2 6-0 |
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| Dalby $25,000 Hard | Nov 2 2003 |
| 1 | Abigail Spears - Muller | 7-5 6-4 |
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| Port Pirie $25,000 Hard | Nov 16 2003 |
| 1 | Jaslyn Hewitt-WC - Muller | 6-3 6-3 |
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| Nuriootpa $25,000 Hard | Nov 23 2003 |
| 1 | Anousjka Van Exel - Muller | 6-1 7-66 |
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| Mount Gambier $25,000 Hard | Nov 30 2003 |
| 1 | Liana Ungur-Q - Muller | 6-3 6-3 |