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Bjergsen joined professional League of Legends in 2013 as a member of Copenhagen Wolves in the European League of Legends Championship Series. Bjergsen was unable to play with the Copenhagen Wolves until Week 3 due to age restrictions put in place by Riot Games. For the first two weeks, he was temporarily replaced by the team's sub cowTard. After he turned 17 years old on February 21, he was able to rejoin the main lineup and play their remaining LCS matches. After finding success with CW, his team was acquired by and re-branded as Ninjas in Pyjamas (NiP) for the Summer LCS.
On November 2, 2013, Bjergsen left NiP to move to North America and joined Team SoloMid as their mid laner.
He was the second player to cross over from the EU to NA LCS, after Edward left Gambit Gaming to join Team Curse during Season 3.
On January 23, 2014, Riot Games announced that Bjergsen violated the LCS rules by approaching and encouraging a contracted LCS player to leave his position at Lemondogs. He admitted the violation and was fined $2,000.
TSM qualified for the 2015 League of Legends World Championship. At Worlds TSM came last in their preliminary group with a record of 1–5, eliminating them from the bracket stage, a trend that would repeat the the 2016 and 2017 World Championships.
Despite the relative lack of success on the international stage, Bjergsen is regarded as one of the best Western players to have ever played the game, leading TSM to 5 NA LCS titles and earning himself several MVP rewards. Despite receiving criticism for this as fans feel Bjergsen's passive play-style affects the whole team, he continues to chase after international success, wanting to achieve it on his own terms and in his own way.