| | |
| Hopman Cup Hard | Jan 9 2005 |
| | Anastasia Myskina - Groenefeld | 6-3 6-3 |
| | Francesca Schiavone - Groenefeld | 6-2 2-6 6-2 |
| | Groenefeld - Gisela Dulko | 3-6 6-2 6-1 |
| | |
| Canberra Tier V Hard | Jan 16 2005 |
| 1 | Groenefeld - Vera Dushevina | 7-5 6-4 |
| 2 | Silvia Farina Elia(1) - Groenefeld | 6-2 6-3 |
| | |
| Australian Open Hard | Jan 30 2005 |
| 1 | Groenefeld - Séverine Beltrame | 6-1 6-3 |
| 2 | Groenefeld - Fabiola Zuluaga(17) | 6-2 7-62 |
| 3 | Vera Dushevina - Groenefeld | 7-5 6-4 |
| | |
| Pattaya City Tier IV Hard | Feb 6 2005 |
| 1 | Groenefeld(7) - Jennifer Hopkins | 6-3 6-2 |
| 2 | Groenefeld(7) - Galina Voskoboeva | 6-4 6-2 |
| QF | Groenefeld(7) - Alona Bondarenko | 6-4 6-1 |
| SF | Groenefeld(7) - Virginia Ruano Pascual(8) | 4-6 6-2 6-2 |
| F | Conchita Martinez(3) - Groenefeld(7) | 6-3 3-6 6-3 |
| | |
| Hyderabad Tier IV Hard | Feb 13 2005 |
| 1 | Groenefeld(2) - Mandy Minella-Q | 6-3 6-4 |
| 2 | Groenefeld(2) - Jarmila Gajdosova-Q | 6-3 6-2 |
| QF | Groenefeld(2) - Tian Tian Sun | 7-65 6-3 |
| SF | Alona Bondarenko(9) - Groenefeld(2) | walkover |
| | |
| Indian Wells Tier I Hard | Mar 20 2005 |
| 1 | Groenefeld(26) | bye |
| 2 | Séverine Beltrame - Groenefeld(26) | 6-3 7-67 |
| | |
| Miami Tier I Hard | Apr 3 2005 |
| 1 | Groenefeld - Julia Schruff-Q | 6-4 6-2 |
| 2 | Venus Williams(8) - Groenefeld | 6-2 6-0 |
| | |
| Amelia Island Tier II Clay | Apr 10 2005 |
| 1 | Magdalena Maleeva - Groenefeld | 6-3 6-3 |
| | |
| Charleston Tier I Clay | Apr 17 2005 |
| 1 | Groenefeld - Carly Gullickson-WC | 6-3 6-3 |
| 2 | Ai Sugiyama(11) - Groenefeld | 6-2 6-4 |
| | |
| Fed Cup II | Apr 24 2005 |
| | Groenefeld - Ayu Fani Damayanti-ina | 6-3 6-1 |
| | Groenefeld - Wynne Prakusya-ina | 6-0 6-2 |
| | |
| Berlin Tier I Clay | May 8 2005 |
| 1 | Groenefeld - Evgenia Linetskaya | 6-1 6-2 |
| 2 | Maria Sharapova(1) - Groenefeld | 6-2 6-2 |
| | |
| Rome Tier I Clay | May 15 2005 |
| 1 | Groenefeld - Antonella Serra Zanetti-WC | 6-1 6-2 |
| 2 | Patty Schnyder(8) - Groenefeld | 6-2 6-4 |
| | |
| Istanbul Tier III Clay | May 22 2005 |
| 1 | Groenefeld(5) - Mariana Diaz-Oliva | 6-3 7-5 |
| 2 | Groenefeld(5) - Emmanuelle Gagliardi | 6-3 6-2 |
| QF | Nicole Vaidisova(2) - Groenefeld(5) | 7-5 7-66 |
| | |
| Roland Garros Clay | Jun 5 2005 |
| 1 | Groenefeld - Roberta Vinci | 7-5 1-6 6-4 |
| 2 | Groenefeld - Anna Smashnova | 6-1 6-0 |
| 3 | Francesca Schiavone(22) - Groenefeld | 7-63 7-5 |
| | |
| Birmingham Tier III Grass | Jun 12 2005 |
| 1 | Stephanie Foretz Gacon - Groenefeld(13) | 6-4 6-3 |
| | |
| Hertogenbosch Tier III Grass | Jun 19 2005 |
| 1 | Groenefeld(7) - Alina Jidkova | 6-3 6-2 |
| 2 | Meghann Shaughnessy - Groenefeld(7) | 7-69 3-6 3-0 |
| | |
| Wimbledon Grass | Jul 3 2005 |
| 1 | Jane O'Donoghue-WC - Groenefeld | 1-6 6-1 6-4 |
| | |
| Fed Cup Play-offs | Jul 10 2005 |
| | Groenefeld - Jelena Kostanic Tosic-cro | 6-1 7-6 |
| | Groenefeld - Karolina Sprem-cro | 6-3 6-7 6-2 |
| | |
| Cincinnati Tier III Hard | Jul 24 2005 |
| 1 | Sania Mirza - Groenefeld(7) | 6-4 6-3 |
| | |
| Stanford Tier II Hard | Jul 31 2005 |
| 1 | Groenefeld - Shahar Peer-Q | 7-5 6-1 |
| 2 | Groenefeld - Lindsay Davenport(1) | 5-0 |
| QF | Groenefeld - Nathalie Dechy(6) | 2-6 6-2 6-3 |
| SF | Kim Clijsters(4) - Groenefeld | 6-4 6-0 |
| | |
| San Diego Tier I Hard | Aug 7 2005 |
| 1 | Groenefeld - Eleni Daniilidou-WC | 7-65 6-4 |
| 2 | Mary Pierce(6) - Groenefeld | 6-1 6-1 |
| | |
| Toronto Tier I Hard | Aug 21 2005 |
| 1 | Conchita Martinez - Groenefeld | 6-1 6-71 7-5 |
| | |
| New Haven Tier II Hard | Aug 28 2005 |
| 1 | Groenefeld - Jelena Kostanic Tosic-Q | 6-4 6-1 |
| 2 | Groenefeld - Meghann Shaughnessy-WC | 6-3 7-5 |
| QF | Amélie Mauresmo(2) - Groenefeld | 6-3 6-2 |
| | |
| US Open Hard | Sep 11 2005 |
| 1 | Groenefeld(31) - Kristina Brandi | 6-2 6-3 |
| 2 | Groenefeld(31) - Virginie Razzano | 3-6 6-3 6-4 |
| 3 | Amélie Mauresmo(3) - Groenefeld(31) | 7-5 6-3 |
| | |
| Bali Tier III Hard | Sep 18 2005 |
| 1 | Groenefeld(5) - Karolina Sprem | 7-5 5-7 6-3 |
| 2 | Aiko Nakamura - Groenefeld(5) | 6-3 1-6 6-1 |
| | |
| Beijing Tier II Hard | Sep 25 2005 |
| 1 | Groenefeld(9) | bye |
| 2 | Groenefeld(9) - Ai Sugiyama-WC | 6-2 6-3 |
| QF | Groenefeld(9) - Shuai Peng | 7-5 6-1 |
| SF | Groenefeld(9) - Marta Domachowska | 7-5 6-3 |
| F | Maria Kirilenko - Groenefeld(9) | 6-3 6-4 |
| | |
| Luxembourg Tier II Hard | Oct 2 2005 |
| 1 | Groenefeld - Eleni Daniilidou | 6-4 6-4 |
| 2 | Groenefeld - Anna Smashnova | 6-1 6-2 |
| QF | Groenefeld - Nadia Petrova(2) | 2-6 6-3 6-2 |
| SF | Groenefeld - Dinara Safina(7) | 6-4 5-7 6-4 |
| F | Kim Clijsters(1) - Groenefeld | 6-2 6-4 |
| | |
| Filderstadt Tier II Hard | Oct 9 2005 |
| 1 | Nadia Petrova(6) - Groenefeld | 6-3 6-2 |
| | |
| Moscow Tier I Carpet | Oct 16 2005 |
| 1 | Groenefeld - Virginie Razzano-LL | 3-6 7-5 6-1 |
| 2 | Maria Sharapova(1) - Groenefeld | 1-6 2-4 |