The League of Legends division of TSM was a gaming team based in Los Angeles, California, that competed in the League Championship Series (LCS), the top-level professional league for video game League of Legends in the United States and Canada, from 2013 to 2023. The organization sold their LCS franchise slot in 2023.

Established in 2011, the League of Legends division was the founding division of Team SoloMid. The team formed from a group of players that represented the community of the online League of Legends blog SoloMid.net, which was founded by brothers Dan Dinh and Andy "Reginald" Dinh. TSM was one of the founding members of the LCS and won the inaugural NA LCS championship. They won five more LCS titles from 2014 to 2017, including three consecutive titles: Summer 2016, Spring 2017, and Summer 2017. Their seventh LCS title came in Summer 2020.

Internationally, TSM has taken part in a total two Mid-Season Invitationals and eight League of Legends World Championships. Their world championship appearances span from the inaugural event in 2011 through 2017, as well as in 2020. They also won the Intel Extreme Masters Season IX World Championship in 2015.

Before entering esports, the origin of Team SoloMid (TSM) traces back to September 2009, when Andy "Reginald" Dinh and his brother Dan Dinh created a blog, which became SoloMid.net, during their college years providing written guides for the game League of Legends. The Dinh brothers were both part of a League of Legends clan called All or Nothing during the game's beta testing, which later rebranded to SoloMid. A small group of players that represented the SoloMid.net community would become the original TSM team: Brandon "Saintvicious" DiMarco, Shan "Chaox" Huang, Brian "TheOddOne" Wyllie, Choi "Locodoco" Yoon-seop, and Reginald. Team SoloMid was officially created in January 2011. Later that year, Riot Games launched the first season of what would become the League Championship Series. By then, both SaintVicious and Locodoco had left the team, and Christian "TheRainMan" Kahmann and Alex "Xpecial" Chu had replaced them to complete TSM's roster of the first season. The same year, Jack Etienne had become the general manager for the team.

In June 2011, Team SoloMid participated in the Season One World Championship. Following a successful performance in the group stage, they faced a setback in the upper bracket semifinals, when they were defeated by Against All Authority [fr] (aAa) by a score of 1–2. This loss dropped them to the lower bracket semifinal, where TSM secured a 2–0 victory against Epik Gaming. In the lower bracket final, Team SoloMid once again crossed paths with aAa, who had previously defeated them in the upper bracket final. In this rematch, aAa was given a one-game advantage due to their prior victory. TSM lost the first match of the best-of-three series, ultimately securing a 3rd place finish in the tournament and a prize of US$15,000. In August, TSM participated in two competitions at Gamescom. They took part in the Global Challenge Cologne, the first live event of Intel Extreme Masters Season VI, as well as ESL Major Series VIII. TSM secured the second-place position in both events, with Counter Logic Gaming (CLG) and SK Gaming winning in the respective finals. Towards the end of October 2011, Team SoloMid moved into a gaming house located in Lindenhurst, New York, making them the first North American team to do so. Subsequently, in the following month, the team won their first LAN event at the 2011 MLG Providence League of Legends tournament.

In January 2012, TSM participated in the IEM Season VI Global Challenge Kyiv. During the group stage, they secured victories against Curse Gaming, SK Gaming, and White Lotus, advancing them to the playoffs. In the semifinals, TSM emerged victorious against Dignitas, securing their spot in the finals. In the championship match, they were pitted against Moscow Five, a team that had maintained an undefeated record throughout the tournament. Team SoloMid fell short in the finals, losing to Moscow Five by a score of 1–2, placing second in the event. Following a disappointing performance at the 2012 IEM World Championship in Hanover, TSM announced that TheRainMan was departing from the team due to internal issues. The team subsequently added Marcus "Dyrus" Hill to their roster on March 12.

After the roster change, TSM finished as the highest placing among North American team through their next eight offline events. In April, they won the IGN Pro League (IPL) 4, beating other top North American teams including Counter Logic Gaming's North America team (CLG.NA), Dignitas, and Curse Gaming. In June, TSM won all three offline tournaments they participated in. The first was the Reign of Gaming International Invitational, although it was the least competitive of these events, as it did not feature other top-level North American teams. Following, they won the MLG Spring Championship, defeating CLG.NA in the finals. Lastly, at the GIGABYTE Esports LAN, although the tournament was not a regular fixture on the circuit, TSM once again emerged victorious, defeating CLG.NA in finals again. In August, at the MLG Summer Arena, TSM defeated Curse Gaming by a score of 3–0 and only lost to Azubu Blaze, who ultimately claimed the title and were widely regarded as the world's top team at that time. A week later, TSM won the IPL Face Off: San Francisco Showdown, where they defeated Curse in the final match. At the end of the month, the team competed in the Season Two Regional qualifier, a qualifier event for the Season Two World Championship. TSM defeated both Curse Gaming and Dignitas, earning the top North American seed.

At the Season Two World Championship, TSM's number one North American seed advanced them directly to the quarterfinals. The tournament featured five major regions, and not all could be seeded directly into the quarterfinal. In a random draw conducted by Riot, Azubu Frost, the top seed from Korea, was selected to enter the event in the group stage. Azubu Frost advanced to the quarterfinals, setting up a quarterfinal match between them and TSM. TSM lost the match to Azubu Frost and were eliminated from the event. Despite their loss, they were the only North American team to play beyond the group stage of the event.