He was expected to compete in the 2012 Thai Fight 70 kg tournament, fighting in the quarter-finals on 23 October 2012 in Bangkok. However, this did not happen for unknown reasons. Replacing Yoshihiro Sato on short notice, he defeated Dzhabar Askerov via unanimous decision in a tournament reserve fight at "" in Rome, Italy on 3 November 2012. He was expected to compete at the "Shoot Boxing World Tournament 2012" in Tokyo, Japan on 17 November 2012. However, he was unable to compete due to the tournament coming so soon after his bout with Askerov. He beat Thai brawler Bovy Sor Udomson by way of majority decision at "Shootboxing 2013 - Act 1" in Tokyo on 22 February 2013. Stevelmans was scheduled to fight Johann Fauveau at "" on 23 March 2013 in London, England. However, when Andy Ristie was unable to fight in the event's co-main event against Albert Kraus, Stevelmans took his place and lost by unanimous decision. He was soundly beaten by Aikpracha Meenayothin, losing on points at "MAX Muay Thai 2" in Pattaya, Thailand on 29 June 2013. He lost to Chingiz Allazov by unanimous decision at "Legend 2: Invasion" in Moscow, Russia on 8 November 2013. Replacing Shemsi Beqiri on short notice, Stevelmans lost to Ky Hollenbeck by unanimous decision in an ugly fight in the tournament reserve match at "" in New York City, New York on 23 November 2013. He lost to Yuri Bessmertny by UD at "Thai Boxe Mania" in Turin, Italy on 25 January 2014. He lost to Josh Jauncey via UD at "" in Broomfield, Colorado, US on 3 April 2014.