Polish sprinter (born 1982)
Marcin Marciniszyn (born 7 September 1982, in Bystrzyca Kłodzka) is a Polish sprinter who specializes in the 400 metres.
| Year | Competition | Venue | Position | Event | Notes |
Representing  Poland |
| 2001 | European Junior Championships | Grosseto, Italy | 1st | 4 × 400 m relay | 3:06.12 |
| 2002 | European Championships | Munich, Germany | – | 4 × 400 m relay | DQ |
| 2003 | World Indoor Championships | Birmingham, United Kingdom | 3rd [1] | 4 × 400 m relay[2] | 3:06.61 |
| 2004 | Olympic Games | Athens, Greece | 10th (h) | 4 × 400 m relay | 3:03.69 |
| 2005 | European Indoor Championships | Madrid, Spain | 6th (h) | 400 m | 46.89 |
| – | 4 × 400 m relay[3] | DQ |
| World Championships | Helsinki, Finland | 24th (h) | 400 m | 45.97 |
| 5th | 4 × 400 m relay | 3:00.58 |
| 2006 | World Indoor Championships | Moscow, Russia | 9th (sf) | 400 m | 46.97 |
| 2nd | 4 × 400 m relay | 3:04.67 |
| European Championships | Gothenburg, Sweden | 12th (sf) | 400 m | 45.96 |
| 2007 | European Indoor Championships | Birmingham, United Kingdom | 3rd | 4 × 400 m relay | 3:08.14 |
| World Championships | Osaka, Japan | 34th (h) | 400 m | 45.83 |
| 3rd | 4 × 400 m relay | 3:00.05 |
| 2009 | European Indoor Championships | Turin, Italy | 3rd | 4 × 400 m relay | 3:07.04 |
| World Championships | Berlin, Germany | 22nd (h) | 400 m | 45.77 |
| 5th | 4 × 400 m relay | 3:02.23 |
| 2010 | World Indoor Championships | Doha, Qatar | 14th (h) | 400 m | 47.23 |
| 9th (h) | 4 × 400 m relay | 3:09.86 |
| European Championships | Barcelona, Spain | 10th (sf) | 400 m | 45.58 |
| 5th | 4 × 400 m relay | 3:03.42 |
| 2011 | European Indoor Championships | Paris, France | 5th | 4 × 400 m relay | 3:09.31 |
| World Championships | Daegu, South Korea | 18th (sf) | 400 m | 45.94 |
| 11th (h) | 4 × 400 m relay | 3:01.84 |
| 2012 | World Indoor Championships | Istanbul, Turkey | 6th | 4 × 400 m relay | 3:11.86 |
| European Championships | Helsinki, Finland | 7th | 400m | 46.46 |
| 4th | 4 × 400 m relay | 3:02.37 |
| Olympic Games | London, United Kingdom | 34th (h) | 400m | 46.35 |
| 9th (h) | 4 × 400 m relay | 3:02.86 |
| 2013 | World Championships | Moscow, Russia | 7th (h) | 4 × 400 m relay | 3:01.73 |
| 2014 | IAAF World Relays | Nassau, Bahamas | 19th (h) | 4 × 400 m relay | 3:05.16 |
Outdoor
- 100 metres – 10.76 s (2012)
- 200 metres – 21.07 s (2011)
- 400 metres – 45.27 s (2011)
Indoor
- 400 metres – 46.64 (2006)
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