Duh raced in Poland for KSM Krosno, Orzeł Łódź, and Ostrovia Ostrów Wielkopolski. He also represented Slovenia on several occasions. Duh appeared in two Grand Prix - the Croatian events in 2010 and 2011, where he appeared as a reserve.
Duh suffered multiple injuries, including skull fractures, a brain haemorrhage, and a fractured hip, in a crash while racing in an Argentine Championship meeting at the Bahia Blanca track in Argentina on 30 January 2013, and died on 3 February, 2 months before his 24th birthday.
- "Slovenian international Matija Duh has died whilst racing in Argentina", skysports.com, 3 February 2013. Retrieved 3 February 2013
- "Matija Duh 1989-2013", speedway365.com, 3 February 2013. Retrieved 3 February 2013 at 6:00 AM.
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