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| Sydney Tier II Hard | Jan 16 2005 |
| Qual 1 | Peng(8) - Camille Pin | 6-4 6-1 |
| Qual 2 | Peng(8) - Tzipora Obziler | 6-0 6-4 |
| Qual 3 | Peng(8) - Denisa Chladkova(4) | 6-1 6-2 |
| 1 | Peng-Q - Mashona Washington-Q | 6-4 6-2 |
| 2 | Peng-Q - Anastasia Myskina(2) | 6-1 6-3 |
| QF | Peng-Q - Nadia Petrova(5) | 6-3 4-2 |
| SF | Alicia Molik(6) - Peng-Q | 6-4 6-3 |
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| Australian Open Hard | Jan 30 2005 |
| 1 | Peng - Maria Elena Camerin | 6-1 6-2 |
| 2 | Venus Williams(8) - Peng | 6-3 6-1 |
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| Pan Pacific Open Tier I Carpet | Feb 6 2005 |
| 1 | Maria Kirilenko - Peng | 6-3 6-2 |
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| Amelia Island Tier II Clay | Apr 10 2005 |
| 1 | Peng - Meghann Shaughnessy | 6-2 2-0 |
| 2 | Vera Zvonareva(6) - Peng | 4-6 6-4 7-67 |
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| Charleston Tier I Clay | Apr 17 2005 |
| 1 | Peng - Marissa Irvin | 6-2 6-4 |
| 2 | Justine Henin - Peng | 6-2 4-6 6-4 |
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| Berlin Tier I Clay | May 8 2005 |
| 1 | Peng - Ai Sugiyama(14) | 7-5 6-4 |
| 2 | Peng - Maria Vento-Kabchi | 6-1 6-2 |
| 3 | Maria Sharapova(1) - Peng | 6-2 6-1 |
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| Rome Tier I Clay | May 15 2005 |
| 1 | Mary Pierce - Peng | 6-1 7-5 |
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| Strasbourg Tier III Clay | May 22 2005 |
| 1 | Peng - Tamarine Tanasugarn | 6-3 6-0 |
| 2 | Peng - Tatiana Golovin(2) | 6-4 3-6 7-5 |
| QF | Marta Domachowska - Peng | 4-6 7-5 6-2 |
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| Roland Garros Clay | Jun 5 2005 |
| 1 | Peng - Mailyne Andrieux-WC | 6-0 6-1 |
| 2 | Lindsay Davenport(1) - Peng | 3-6 7-64 6-0 |
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| Stanford Tier II Hard | Jul 31 2005 |
| 1 | Iveta Benesova - Peng | 6-4 7-63 |
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| San Diego Tier I Hard | Aug 7 2005 |
| 1 | Peng - Ma. Emilia Salerni-Q | 7-5 6-1 |
| 2 | Peng - Elena Dementieva(3) | 7-5 6-4 |
| 3 | Peng - Dinara Safina(16) | 7-62 6-0 |
| QF | Peng - Kim Clijsters(7) | 6-4 6-4 |
| SF | Mary Pierce(6) - Peng | 6-2 6-2 |
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| Los Angeles Tier II Hard | Aug 14 2005 |
| 1 | Peng - Maria Vento-Kabchi | 7-65 6-0 |
| 2 | Francesca Schiavone(13) - Peng | 4-6 7-61 6-4 |
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| New Haven Tier II Hard | Aug 28 2005 |
| Qual 1 | Peng(1) - Nicole Pratt | 5-7 7-5 6-4 |
| Qual 2 | Peng(1) - Julia Schruff | 6-4 6-1 |
| Qual 3 | Peng(1) - Shenay Perry-WC | 6-3 3-6 6-2 |
| 1 | Vera Douchevina - Peng-Q | 6-4 6-4 |
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| US Open Hard | Sep 11 2005 |
| 1 | Emma Laine-Q - Peng | 3-6 7-64 6-2 |
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| Beijing Tier II Hard | Sep 25 2005 |
| 1 | Peng - Emma Laine-Q | 6-1 6-1 |
| 2 | Peng - Mariana Diaz-Oliva | 3-6 6-2 7-60 |
| QF | Anna-Lena Groenefeld(9) - Peng | 7-5 6-1 |
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| Guangzhou Tier III Hard | Oct 2 2005 |
| 1 | Peng(2) - Evie Dominikovic | 6-3 6-4 |
| 2 | Peng(2) - Tzipora Obziler | 6-4 6-4 |
| QF | Viktoria Azarenka-Q - Peng(2) | 6-4 1-0 |