| Athletes |
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Biographical data for: Jorn HOLWERDA
| Classifications in season 2017/2018: |
| 04/08/17 | Oberstdorf GER | Oberstdorf Summer Camp Trophy | Junior B Men | | Overall Ranking: 12th, 500 meter: 11th, 1000 meter: 10th | | 02/09/17 | Heerenveen NED | KNSB Cup 1 | Divisie D | | Overall Ranking: 15th, 1000 meter: 15th | | 14/10/17 | Zoetermeer NED | KNSB Cup 2 | Divisie C | | Overall Ranking: 1st, 1500 meter: 1st | | 22/10/17 | Groningen NED | Autumn Tournament | Men Junior A/B | | Overall Ranking: 9th, 500 meter: 9th, 1000 meter: 8th | | 05/11/17 | Leeuwarden NED | KNSB Cup 3 | Divisie C | | Overall Ranking: 5th, 500 meter: 5th | | 10/11/17 | Davos SUI | Starclass 2 (SAB-1) | Men Junior B | | Overall Ranking: 21st, 500 meter: 29th, 1000 meter: 16th, 1500 meter: 24th | | 13/01/18 | Utrecht NED | KNSB Cup 5 | Divisie B | | Overall Ranking: 16th, 1000 meter: 16th | | 09/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Men Junior B | | Overall Ranking: 20th, 500 meter: 24th, 1000 meter: 15th, 1500 meter: 17th | | 17/02/18 | Heerenveen NED | KNSB Cup 6 | Divisie A | | Overall Ranking: 23rd, 1500 meter: 23rd | | 17/03/18 | Utrecht NED | National Championships Netherlands Juniors - Regional League Final | Heren Junioren B | | Overall Ranking: 12th, 500 meter: 12th, 1000 meter: 11th, 1500 meter: 12th | | 23/03/18 | Groningen NED | Clubwedstrijd STG | Junioren/Senioren | | Overall Ranking: 2nd, 500 meter: 2nd, 1000 meter: 2nd | | 23/03/18 | Leeuwarden NED | Club competition Trias | Pupillen A | | Overall Ranking: 2nd, 500 meter: 2nd, 1000 meter: 2nd |
| Results in season 2017/2018: |
| 500 meter |
| 45 | .629 | 11/11/17 | Davos SUI | Starclass 2 (SAB-1) | Semi Finals, Group 4 | |
| 46 | .269 | 10/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Semi Final, Group 3 | |
| 46 | .661 | 10/11/17 | Davos SUI | Starclass 2 (SAB-1) | Heats, Group 1 | |
| 46 | .676 | 10/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Final, Group 6 |  |
| 46 | .697 | 18/03/18 | Utrecht NED | National Championships Netherlands Juniors - Regional League Final | Heats | |
| 46 | .820 | 05/11/17 | Leeuwarden NED | KNSB Cup 3 | Heats, Groep 1 | |
| 46 | .827 | 11/11/17 | Davos SUI | Starclass 2 (SAB-1) | Final, Group 7 | |
| 47 | .075 | 05/11/17 | Leeuwarden NED | KNSB Cup 3 | Halve Finales, Groep 1 | |
| 47 | .137 | 04/08/17 | Oberstdorf GER | Oberstdorf Summer Camp Trophy | Final, Group 3 | |
| 47 | .187 | 04/08/17 | Oberstdorf GER | Oberstdorf Summer Camp Trophy | Heats, Group 1 | |
| 47 | .227 | 10/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Quarter Finals, Group 2 | |
| 47 | .321 | 22/10/17 | Groningen NED | Autumn Tournament | Final, Group 3 | |
| 47 | .650 | 11/11/17 | Davos SUI | Starclass 2 (SAB-1) | Quarter Finals, Group 2 | |
| 47 | .915 | 09/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Heats, Group 1 | |
| 48 | .506 | 22/10/17 | Groningen NED | Autumn Tournament | Semi Final, Group 2 | |
| 48 | .688 | 22/10/17 | Groningen NED | Autumn Tournament | Heats, Group 1 | |
| 49 | .78 | 23/03/18 | Groningen NED | Clubwedstrijd STG | Finale, Groep 1 | |
| 50 | .92 | 23/03/18 | Groningen NED | Clubwedstrijd STG | Halve Finales, Groep 1 | |
| 51 | .01 | 23/03/18 | Groningen NED | Clubwedstrijd STG | Heats, Groep 1 | |
| 58 | .986 | 04/08/17 | Oberstdorf GER | Oberstdorf Summer Camp Trophy | Quarter Finals, Group 1 | |
| 1:12 | .872 | 05/11/17 | Leeuwarden NED | KNSB Cup 3 | Finale, Groep 1 | |
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| 777 meter |
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| 1000 meter |
| 1:35 | .207 | 18/03/18 | Utrecht NED | National Championships Netherlands Juniors - Regional League Final | Heats | |
| 1:35 | .473 | 11/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Final, Group 4 | |
| 1:35 | .923 | 22/10/17 | Groningen NED | Autumn Tournament | Final, Group 2 | |
| 1:36 | .318 | 12/11/17 | Davos SUI | Starclass 2 (SAB-1) | Semi Finals, Group 2 | |
| 1:37 | .450 | 11/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Semi Final, Group 2 | |
| 1:37 | .554 | 10/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Quarter Finals, Group 2 | |
| 1:38 | .491 | 02/09/17 | Heerenveen NED | KNSB Cup 1 | Halve Finale, Groep 2 | |
| 1:41 | .732 | 05/08/17 | Oberstdorf GER | Oberstdorf Summer Camp Trophy | Heats, Group 1 | |
| 1:42 | .138 | 13/01/18 | Utrecht NED | KNSB Cup 5 | Halve Finale, Groep 2 | |
| 1:42 | .301 | 13/01/18 | Utrecht NED | KNSB Cup 5 | Finale, Groep 4 | |
| 1:42 | .586 | 10/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Heats, Group 1 | |
| 1:43 | .365 | 17/02/18 | Heerenveen NED | KNSB Cup 6 | Heats, Groep 1 | |
| 1:44 | .11 | 23/03/18 | Groningen NED | Clubwedstrijd STG | Finale, Groep 1 | |
| 1:46 | .425 | 14/10/17 | Zoetermeer NED | KNSB Cup 2 | Heats, Groep 1 | |
| 1:46 | .891 | 05/08/17 | Oberstdorf GER | Oberstdorf Summer Camp Trophy | Final, Group 3 | |
| 1:46 | .990 | 11/11/17 | Davos SUI | Starclass 2 (SAB-1) | Heats, Group 1 | |
| 1:51 | .349 | 12/11/17 | Davos SUI | Starclass 2 (SAB-1) | Final, Group 4 | |
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| 1500 meter |
| 2:27 | .204 | 10/11/17 | Davos SUI | Starclass 2 (SAB-1) | Final, Group 4 | |
| 2:30 | .320 | 17/03/18 | Utrecht NED | National Championships Netherlands Juniors - Regional League Final | Heats | |
| 2:30 | .378 | 17/03/18 | Utrecht NED | National Championships Netherlands Juniors - Regional League Final | Finale, B | |
| 2:32 | .334 | 17/02/18 | Heerenveen NED | KNSB Cup 6 | Finale, Groep 4 | |
| 2:33 | .859 | 10/11/17 | Davos SUI | Starclass 2 (SAB-1) | Semi Finals, Group 2 | |
| 2:34 | .005 | 10/11/17 | Davos SUI | Starclass 2 (SAB-1) | Heats, Group 1 | |
| 2:42 | .384 | 17/02/18 | Heerenveen NED | KNSB Cup 6 | Halve Finale, Groep 2 | |
| 2:46 | .448 | 09/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Semi Final, Group 1 | |
| 2:47 | .564 | 09/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Final, Group 3 | |
| 2:47 | .590 | 14/10/17 | Zoetermeer NED | KNSB Cup 2 | Halve Finales, Groep 1 | |
| 3:04 | .905 | 09/02/18 | Leeuwarden NED | Starclass-6 (SAB-3) | Heats, Group 1 | |
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