| UTR Pro Tennis Series Copenhagen Women | 2021/05/25 11:00 | Romy Koelzer v Phillippa Preugschat | 6-2,6-0 |
| UTR Pro Tennis Series Copenhagen Women | 2021/05/24 10:00 | Irys Ekani v Romy Koelzer | 1-6,4-5 |
| ITF W15 Antalya | 2021/04/27 11:05 | Manca Pislak v Romy Koelzer | 6-1,6-3 |
| ITF W15 Antalya | 2021/04/20 07:00 | Romy Koelzer v Polina Kudermetova | 5-7,4-6 |
| ITF W15 Antalya | 2021/04/14 08:40 | So-Ra Lee v Romy Koelzer | 2-6,6-2,6-0 |
| ITF W15 Heraklion | 2020/11/19 07:30 | Sapfo Sakellaridi v Romy Koelzer | 3-6,2-6 |
| ITF W15 Heraklion | 2020/11/18 07:30 | Shavit Kimchi v Romy Koelzer | 2-6,4-6 |
| ITF W15 Heraklion | 2020/11/15 08:00 | Alexandra Cadantu v Romy Koelzer | 3-6,6-1,2-6 |
| UTR Pro Tennis Series Copenhagen Women | 2021/05/24 10:00 | Maja Radenkovic v Berta Passola | 6-7,4-5 |