After going 6 amateur-fights 2001-2004, Troéng started doing MMA as a professional in 2005 mostly fighting in smaller promotions in Sweden and other parts of Europe. Since Troéng didn’t have a manager at the time, he accepted every fight that he was offered, even against opponents that was considered to be way above him in the ranks, which was leading to him being an underdog in a lot of his fights. Despite all this, by 2012 he had racked up a record of 15-4-1 with a victory over UFC veteran Mark Weir and fights against notable opponents like Mamed Khalidov, Lucio Linhares, former UFC title challenger Thales Leites and Pride veteran Daniel Acácio. Troéng is considered one of the best middleweight mixed martial artists to come out of Sweden and Scandinavia.
''The Ultimate Fighter''
In January 2013, it was announced that Troéng was selected for. To get into the TUF house, Troéng defeated Scott Rosa by Submission. During the choosing of teams, he was the fourth pick of Chael Sonnen for Team Sonnen and seventh overall. He faced Josh Samman in the preliminary round. He lost the fight by KO.
Ultimate Fighting Championship
Troéng made his UFC debut against castmate Adam Cella on April 6, 2013 at UFC on Fuel TV 9. He won the fight via submission due to a rear naked choke in the first round. Troéng fought Rafael Natal on September 4, 2013 at. Early in the second round Troeng was knocked down by a huge right hand followed up by some ground and pound from Natal, but was able to survive and recover from it. He lost by unanimous decision. The performance earned him Fight of the Night honors along with Natal. Troéng was expected to face castmate Robert McDaniel on March 15, 2014 at UFC 171. But he was later forced to withdraw from the bout due to a shoulder injury and was replaced by Sean Strickland. Troéng faced Trevor Smith on July 19, 2014 at UFC Fight Night 46. He lost the fight by unanimous decision. Troéng faced Krzysztof Jotko on October 4, 2014 at. He lost the fight by unanimous decision. After his loss to Jotko, Troéng retired from MMA competition.
Personal life
Troéng has a master's degree in Engineering physics and he is still working part-time doing research in mathematics, at the University of Umeå. After retiring from his own fighting career, Troéng has since taken the role as a fight promoter. In doing so he has brought back the Swedish organisation Battle of Botnia, which he fought for himself in 2009 and 2011, and which had been inactive for about four years. The first event under the organisation's new promotion, and the fifth in total count, took place on November 28, 2015 at Battle of Botnia 2015, in Troéng's hometown of Umeå. The event was headlined by Troéng's former training partner, UFC veteran Niklas Bäckström, and the card did also feature up and coming fighters from Troéng's own gym, Renyi Fight Camp.
