Sietse van der Werff
Netherlands (NED)24 May 1956 (M55)
Personal Records
| 500m | 44,07 | 11 November 2012 | Inzell (GER) |
| 1000m | 1.27,92 | 20 November 2011 | Erfurt (GER) |
| 1500m | 2.08,21 | 25 February 2011 | Calgary (CAN) |
| 3000m | 4.23,87 | 24 February 2011 | Calgary (CAN) |
| 5000m | 7.24,88 | 26 February 2011 | Calgary (CAN) |
| 10000m | 16.03,61 | 24 March 2011 | Heerenveen (NED) |
Season Bests
| 500m | 44,07 | 11 November 2012 | Inzell (GER) |
| 1500m | 2.11,67 | 8 December 2012 | Heerenveen (NED) |
| 3000m | 4.34,28 | 11 November 2012 | Inzell (GER) |
| 5000m | 8.20,77 | 10 February 2013 | Deventer (NED) |
| 10000m | 16.37,32 | 17 February 2013 | Amsterdam (NED) |
| 500m | 44,45 | 9 March 2012 | Erfurt (GER) |
| 1000m | 1.27,92 | 20 November 2011 | Erfurt (GER) |
| 1500m | 2.09,58 | 10 March 2012 | Erfurt (GER) |
| 3000m | 4.29,66 | 20 November 2011 | Erfurt (GER) |
| 5000m | 7.38,70 | 11 March 2012 | Erfurt (GER) |
| 500m | 44,38 | 2 November 2010 | Heerenveen (NED) |
| 1500m | 2.08,21 | 25 February 2011 | Calgary (CAN) |
| 3000m | 4.23,87 | 24 February 2011 | Calgary (CAN) |
| 5000m | 7.24,88 | 26 February 2011 | Calgary (CAN) |
| 10000m | 16.03,61 | 24 March 2011 | Heerenveen (NED) |
| 500m | 44,23 | 27 October 2009 | Heerenveen (NED) |
| 1000m | 1.31,95 | 13 February 2010 | Amsterdam (NED) |
| 1500m | 2.09,42 | 27 October 2009 | Heerenveen (NED) |
| 3000m | 4.28,59 | 17 November 2009 | Heerenveen (NED) |
| 5000m | 7.57,55 | 15 January 2010 | Breda (NED) |
| 500m | 44,46 | 15 January 2009 | Assen (NED) |
| 1500m | 2.09,84 | 12 December 2008 | Heerenveen (NED) |
| 3000m | 4.28,60 | 16 December 2008 | Heerenveen (NED) |
| 5000m | 7.50,13 | 2 November 2008 | Amsterdam (NED) |
| 500m | 45,15 | 21 December 2007 | Heerenveen (NED) |
| 1000m | 1.30,33 | 3 November 2007 | Amsterdam (NED) |
| 1500m | 2.11,57 | 9 November 2007 | Heerenveen (NED) |
| 3000m | 4.31,96 | 21 December 2007 | Heerenveen (NED) |
| 5000m | 7.44,90 | 17 January 2008 | Utrecht (NED) |
| 10000m | 16.35,71 | 24 February 2008 | Amsterdam (NED) |
Results
| Kampioenschap van Amsterdam | Amsterdam (NED) | 23 March 2013 | ||||||||||||||||
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| Clubkampioenschappen HCA | Amsterdam (NED) | 16 March 2013 | ||||||||||||||||
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| Lange Afstanden | Amsterdam (NED) | 17 February 2013 | ||||||||||||||||
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| Netherlands - Masters Championships 2013 | Deventer (NED) | 9 - 10 February 2013 | ||||||||||||||||
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| Clubavond ASV-HCA-JE | Amsterdam (NED) | 26 January 2013 | ||||||||||||||||
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