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Thirza Sierdsma
| Last name | Sierdsma |
| First name | Thirza |
| Gender | Female |
| Birthdate | 08.2000 |
| Country | NED |
| 500m | 43,06 (Heerenveen, 06.01.2020) |
| 1.000m | 1.24,86 (Leeuwarden, 22.12.2019) |
| 1.500m | 2.09,86 (Heerenveen, 20.01.2020) |
| 3.000m | 4.38,45 (Heerenveen, 18.11.2019) |
| Sprint | 85,490 |
| Mini Combo | 175,184 |
| Tiny Combo | 128,776 |
| Latest update in | 2020 |
NED