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Biographical data for: Siebren TIEMERSMA
| Classifications in season 2025/2026: |
| 01/11/25 | Groningen NED | International Autumn Tournament | Men Senior | | Overall Ranking: 5th, 500 meter: 5th, 500 meter: 4th, 1000 meter: 5th, 1000 meter: 6th | | 01/11/25 | Groningen NED | International Autumn Tournament | Men BAS | | Overall Ranking: 5th, 500 meter: 5th, 500 meter: 4th, 1000 meter: 5th, 1000 meter: 6th | | 28/02/26 | Hasselt BEL | Speculaas Cup - Golden Sun Award 3 | Men Performance Group | | Overall Ranking: 8th, 500 meter: 5th, 500 meter: 3rd, 1000 meter: 5th, 1000 meter: 15th | | 28/02/26 | Hasselt BEL | Speculaas Cup - Golden Sun Award 3 | Men Senior | | Overall Ranking: 8th, 500 meter: 5th, 500 meter: 3rd, 1000 meter: 5th, 1000 meter: 15th | | 20/03/26 | Leeuwarden NED | Club Championships TRIAS (only Trias) | Junior CBA/Senior | | 500 meter: 3rd, 3000 meter: 4th |
| Results in season 2025/2026: |
| 333 meter |
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| 500 meter |
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| 1000 meter |
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