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| Bastad $10,000 | Jan 28 2001 |
| 1 | Muller(5) - Maja Mlakar | 6-2 6-3 |
| 2 | Muller(5) - Karina Jacobsgaard-Q | 6-3 6-3 |
| QF | Muller(5) - Syna Schreiber(1) | walkover |
| SF | Muller(5) - Adriana Jerabek(3) | 5-7 6-1 6-4 |
| F | Muller(5) - Margit Ruutel(8) | 6-2 6-0 |
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| Sutton $25,000 | Feb 18 2001 |
| Qual 1 | Muller - Claire Ricketts | 6-2 5-7 6-0 |
| Qual 2 | Muller - Jelena Pandzic | 6-0 6-4 |
| 1 | Maria Goloviznina - Muller-Q | 6-0 6-1 |
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| Buchen $10,000 | Mar 11 2001 |
| 1 | Muller - Veronika Raimrova | 2-6 6-2 6-4 |
| 2 | Stefanie Weis-Q - Muller | 6-4 2-6 6-3 |
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| CD Juarez $25,000 | Apr 8 2001 |
| Qual 1 | Muller - Katerina Basternakova | 6-2 6-2 |
| Qual 2 | Muller - Andrea Nathan | 7-5 6-4 |
| Qual 3 | Muller - Nannie De Villiers | 3-6 6-4 6-3 |
| 1 | Maria Elena Camerin(6) - Muller-Q | 6-3 7-5 |
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| San Luis Potosi $25,000 | Apr 15 2001 |
| Qual 1 | Muller - Marina Petrovic | 6-3 6-3 |
| Qual 2 | Muller - Tiffany Dabek(7) | 6-2 6-2 |
| Qual 3 | Muller - Cindy Watson(1) | 6-1 3-6 6-0 |
| 1 | Muller-Q - Zuzana Valekova | 6-4 6-4 |
| 2 | Muller-Q - Francesca Lubiani(5) | 6-3 7-63 |
| QF | Muller-Q - Lourdes Lopez-WC | 6-3 1-6 6-4 |
| SF | Muller-Q - Hana Sromova | 6-73 6-4 6-4 |
| F | Maria Elena Camerin(6) - Muller-Q | 6-4 7-5 |
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| Hamburg Tier II Clay | May 6 2001 |
| Qual 1 | Muller-WC - Jana Kandarr(2) | 4-6 7-5 6-0 |
| Qual 2 | Muller-WC - Adriana Jerabek-WC | 6-4 6-4 |
| Qual 3 | Muller-WC - Adriana Rikl Gersi(6) | 6-3 6-2 |
| 1 | Gala Leon-Garcia - Muller-Q | 6-1 6-2 |
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| Berlin Tier I Clay | May 13 2001 |
| Qual 1 | Muller-WC - Jana Nejedly(23) | 7-64 6-4 |
| Qual 2 | Muller-WC - Vanessa Henke-WC | 4-6 6-2 6-1 |
| 1 | Muller-Q - Anne-Gaelle Sidot | 6-1 6-4 |
| 2 | Conchita Martinez(6) - Muller-Q | 6-3 3-6 7-67 |
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| Strasbourg Tier III Clay | May 27 2001 |
| Qual 1 | Muller - Marie-Gayanay Mikaelian | walkover |
| Qual 2 | Sandra Cacic(1) - Muller | 6-3 6-1 |
| 1 | Anke Huber(4) - Muller-LL | 7-5 6-1 |
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| Biella $25,000 Hard | Jun 3 2001 |
| 1 | Vanesa Krauth-Q - Muller(2) | 6-3 6-2 |
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| Marseille $25,000 | Jun 17 2001 |
| 1 | Muller - Katarina Misic-LL | 6-3 6-0 |
| 2 | Muller - Sandra Kleinova(5) | 6-2 7-5 |
| QF | Muller - Emmanuelle Gagliardi(2) | 7-5 6-3 |
| SF | Karina Habsudova(4) - Muller | 7-5 6-2 |
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| Wimbledon Grass | Jul 8 2001 |
| Qual 1 | Muller - Michaela Pastikova | 6-3 6-2 |
| Qual 2 | Julia Vakulenko - Muller | 6-2 3-6 8-6 |
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| Vaihingen $25,000 | Jul 8 2001 |
| 1 | Muller(3) - Jana Hlavackova | 7-5 6-3 |
| 2 | Muller(3) - Nina Duebbers | 7-5 6-1 |
| QF | Muller(3) - Susi Lohrmann-Q | 6-4 6-1 |
| SF | Gabriela Volekova - Muller(3) | walkover |
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| Knokke-Heist Tier IV Clay | Jul 22 2001 |
| Qual 1 | Muller(4) - Ana Timotic | 6-2 6-4 |
| Qual 2 | Muller(4) - Michelle Gerards-WC | 6-2 6-1 |
| Qual 3 | Muller(4) - Zuzana Ondraskova(8) | 6-2 6-3 |
| 1 | Muller-Q - Tatiana Poutchek | 6-2 6-4 |
| 2 | Angeles Montolio(4) - Muller-Q | 6-4 6-2 |
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| Ettenheim $50,000 | Jul 29 2001 |
| 1 | Muller(9) - Mariam Ramon Climent | 6-1 6-3 |
| 2 | Katalin Marosi - Muller(9) | 6-4 6-1 |
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| Basel Tier IV Clay | Aug 5 2001 |
| Qual 1 | Muller(7) - Camilla Kremer | 4-6 6-3 6-2 |
| Qual 2 | Muller(7) - Myriam Casanova-WC | 3-6 6-4 7-62 |
| Qual 3 | Muller(7) - Maja Palaversic Coopersmith(3) | 6-3 6-0 |
| 1 | Muller-Q - Silvija Talaja | 6-4 7-5 |
| 2 | Muller-Q - Francesca Schiavone(4) | 6-2 6-1 |
| QF | Cristina Torrens Valero(6) - Muller-Q | 6-4 7-5 |
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| Bronx $50,000 | Aug 19 2001 |
| 1 | Muller - Lubomira Bacheva(5) | 6-2 6-3 |
| 2 | Muller - Saori Obata | 7-5 6-4 |
| QF | Muller - Clarisa Fernandez | 7-5 7-5 |
| SF | Muller - Maria Elena Camerin(4) | 1-6 6-4 6-4 |
| F | Barbara Schwartz - Muller | 5-7 6-3 7-63 |
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| US Open Hard | Sep 9 2001 |
| Qual 1 | Muller(4) - Anousjka Van Exel | 7-5 6-4 |
| Qual 2 | Muller(4) - Ally Baker-WC | 6-1 6-3 |
| Qual 3 | Evgenia Kulikovskaya - Muller(4) | 2-6 6-4 7-5 |
| 1 | Denisa Chladkova - Muller-LL | 6-1 6-2 |
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| Bordeaux $75,000 | Sep 16 2001 |
| 1 | Muller - Maria Elena Camerin(4) | 6-4 7-61 |
| 2 | Muller - Michaela Pastikova | 6-2 6-4 |
| QF | Muller - Angelika Roesch-Q | 6-3 4-6 6-2 |
| SF | Anna Smashnova(5) - Muller | 7-63 6-3 |
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| Leipzig Tier II Carpet | Sep 30 2001 |
| Qual 1 | Selima Sfar - Muller | 6-2 6-3 |
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| Moscow Tier I Carpet | Oct 7 2001 |
| Qual 1 | Klara Koukalova - Muller | 6-2 6-4 |
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| Filderstadt Tier II Hard | Oct 14 2001 |
| Qual 1 | Maja Matevzic - Muller | 6-3 6-2 |
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| Linz Tier II Carpet | Oct 28 2001 |
| Qual 1 | Asa Svensson - Muller | 7-5 6-73 6-3 |
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| Fed Cup Final | Nov 7 2001 |
| | Justine Henin-bel - Muller | 6-3 6-1 |
| | Muller - Conchita Martinez-esp | 6-1 7-5 |