Sebastian first appeared on the pro scene in 2011. In 2012, he played for Western Wolves and mTw, together with the latter he won DreamHack Summer 2012. Later he played in various teams and mixes, but did not achieve success. After joining Sigma.int, he competed at major competitions several times.
From 2016 to 2018 he was a mentor for OG. Under his leadership, the team won three majors.
In the 2017/2018 season, Sebastian had to play for OG as a substitute player. In June 2018, he becomes the official player of the team and prepares for The International 2018. At the World Championship, the five unexpectedly take 1st place and receive more than 11 million dollars as a reward.