Stadium: Court 3 Round: 25 Ground: Clay
| WTA - Cluj-Napoca | 2021/08/01 14:10 | Stewart, Katerina v Irina Fetecau | 1-6,5-7 |
| ITF W25 Naples | 2021/05/07 13:30 | Irina Fetecau v Stewart, Katerina | 6-2,1-6,6-1 |
| ITF W25 Daytona Beach | 2021/11/14 16:55 | Alycia Parks v Irina Fetecau | 1-6,2-6 |
| ITF W25 Daytona Beach | 2021/11/13 17:35 | Su Jeong Jang v Irina Fetecau | 4-6,5-7 |
| ITF W25 Daytona Beach | 2021/11/12 15:00 | Marie Benoit v Irina Fetecau | 7-6,3-6,4-6 |
| ITF W25 Daytona Beach | 2021/11/11 14:30 | Graham, Alexa v Irina Fetecau | 1-6,4-6 |
| ITF W25 Daytona Beach | 2021/11/10 18:55 | Levashova, Evgeniya v Irina Fetecau | 2-6,1-6 |
| ITF W25 Lagos | 2021/10/13 09:30 | Irina Fetecau v Antonia Ruzic | 3-6,4-6 |
| ITF W80 Le Neubourg | 2021/09/28 10:20 | Irina Fetecau v Amandine Hesse | 1-6,2-6 |
| WTA Portoroz | 2021/09/13 09:00 | Katie Boulter v Irina Fetecau | 7-6,6-2 |
| ITF W25 Daytona Beach | 2021/11/09 16:25 | Stewart, Katerina v Ivana Popovic | 2-6,6-2,5-7 |
| ITF W25 Orlando | 2021/11/03 20:05 | Allie Kiick v Stewart, Katerina | 6-1,3-6,6-1 |
| ITF W15 Hilton Head | 2021/10/10 18:00 | Raveena Kingsley v Stewart, Katerina | 4-6,2-6 |
| ITF W15 Hilton Head | 2021/10/10 14:00 | Ania Hertel v Stewart, Katerina | 4-6,6-7 |
| ITF W15 Hilton Head | 2021/10/09 16:15 | Marcinkevica, Deniza v Stewart, Katerina | 4-6,1-6 |
| ITF W15 Hilton Head | 2021/10/09 13:00 | Mckenna Schaefbauer v Stewart, Katerina | 0-6,6-4,3-10 |
| ITF W15 Hilton Head | 2021/10/05 19:20 | Lutzeier, Lena v Stewart, Katerina | 1-6,1-6 |
| WTA - Cluj-Napoca | 2021/08/01 14:10 | Stewart, Katerina v Irina Fetecau | 1-6,5-7 |