Marc Burns placed second in the men's 100 metres dash at the Bislett Games IAAF Golden League meet in Oslo in July 2005, in preparation for the 2005 World Championships in Athletics. At the 2005 World Championships he won (together with Kevon Pierre, Jacey Harper and Darrel Brown) a silver medal. Later that year he won the World Athletics Final.
At the 2006 Commonwealth Games he won a bronze medal over 100 metres.
At the London Grand Prix he ran a season's best time of 9.97 seconds coming second behind former world record holder Asafa Powell.
In the 2008 Summer Olympics he competed at the 100 metres sprint and placed 2nd in his heat after Samuel Francis in a time of 10.46 seconds. He qualified for the second round in which he improved his time to 10.05 seconds, winning his race with opponents as Kim Collins and Tyrone Edgar. In the semi finals he finished 3rd (9.97 seconds) in his heat behind Usain Bolt and Walter Dix and qualified for the final. There he finished his race in 7th place in a time of 10.01 seconds. Together with Keston Bledman, Aaron Armstrong and Richard Thompson he also competed at the 4x100 metres relay. In their qualification heat they placed first in front of Japan, the Netherlands and Brazil. Their time of 38.26 was the fastest of all sixteen teams participating in the first round and they qualified for the final. Armstrong was replaced by Emmanuel Callender for the final race and they sprinted to a time of 38.06 seconds, the second time after the Jamaican team, winning the silver medal.
At the 2012 Summer Olympics, he was part of the Trinidad and Tobago team that won the silver medal in the men's 4 × 100 m relay. He was also part of the team that won the bronze medal at the 2014 Commonwealth Games.
|Distance||Time||Wind||Location / Date|
|100 m||9.96 s||+ 1.0 m/s||Port-of-Spain / 25 June 2005|
|200 m||20.57 s||—||Hermosillo / 21 May 2005|
|Distance||Time||Location / Date|
|60 m||6.55 s||Birmingham /19 February 2011|
- "Athlete biography: Marc Burns". Beijing2008.cn. Archived from the original on 2 September 2008. Retrieved 26 August 2008.
- Majendie, Paul (25 August 2004). "Athletes from Kiribati make Games history". Hindustan Times. Retrieved 6 May 2018.
- "Glasgow 2014 - Marc Burns Profile". g2014results.thecgf.com. Retrieved 12 May 2015.
- "Glasgow 2014 - Men's 4 x 100m Relay Final". g2014results.thecgf.com. Retrieved 12 May 2015.
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