2017 Mid-Season Invitational

A New Expanded Format

The 2017 Mid-Season Invitational introduced a significant change to its structure. For the first time, the tournament was extended to include 13 teams, one from each of the premier League of Legends leagues worldwide. This expansion led to the creation of a new Play-in Stage. Teams from Europe, South Korea, and China earned direct entry into the main group stage based on their regions' past international performance. The other ten regional champions, including those from North America and the LMS, had to fight through the Play-in Stage for a spot in the main event.

The qualification system was based on results from the previous two years of MSI and the World Championship. This system granted Europe, South Korea, and China the privilege of starting in the Main Group stage. North America and the LMS region started in the second round of the Play-in. Eight teams from various wildcard regions began the tournament in the first round of the Play-in, replacing the previous Mid-Season International Wildcard Invitational format used in 2015 and 2016.

The Play-in Stage Structure

The Play-in Stage was the gateway to the tournament for most competitors. It began with eight teams from wildcard regions competing in a first round. The winners then faced the teams from North America and the LMS in the second round. The final phase of the Play-in was a knockout series where the winners advanced to the main group stage.

In the group phase of the Play-in, the first-place team from each group advanced to the next round. The knockout matches determined which teams would reach the main event, with the losers of certain series dropping to a third round. A notable result from this stage saw the GIGABYTE Marines from the Southeast Asian GPL defeat SuperMassive eSports 3–1 to earn their place. This victory had lasting implications, securing an additional competitive spot for the GPL region at the upcoming 2017 World Championship for the Summer Split runner-up, while the Summer Split winner would get a direct spot in the Main Group Stage.

The Main Event in Brazil

The tournament was hosted across two Brazilian cities, São Paulo and Rio de Janeiro. The action moved to the Jeunesse Arena in Rio de Janeiro for the decisive knockout rounds. This marked the first time a major Riot Games international event was held in South America, bringing top-level League of Legends esports to a new and passionate fanbase. The event spanned nearly a full month, from late April to late May, making it the longest Mid-Season Invitational held up to that point.

Group and Knockout Stages

Six teams competed in the main group stage after the Play-in. The group stage determined the seeding for the single-elimination knockout bracket. In the semifinals, the format followed a clear seeding structure where the first-place team from the group faced the fourth-place team, while the second-place team played the third-place team. All matches in the knockout stage, including the semifinals and final, were played as best-of-five series, testing teams' depth and adaptability over multiple games.

The tournament served as the major international competition held between the first and second splits of all competitive regions. This timing made it a crucial mid-year benchmark for the global League of Legends meta and team strength heading into the summer season and the subsequent World Championship.

SK Telecom T1's Title Defense

The tournament culminated in a grand final between South Korea's SK Telecom T1 and Europe's G2 Esports. SKT, the defending champions from the 2016 MSI, were looking to secure back-to-back titles. They achieved this goal with a commanding 3–1 victory over G2. This win reinforced SK Telecom T1's dominance in the international scene during that era.

For their championship run, the team claimed the top prize of $676,000 from the total prize pool of $1,690,000. The victory marked the third edition of the Mid-Season Invitational and the second consecutive win for the South Korean organization, confirming it as one of the most successful teams in the tournament's history at that time.

Legacy and Impact

The 2017 MSI set important precedents for future tournaments. The successful implementation of the expanded 13-team format with a Play-in Stage became a blueprint for subsequent international events, including the World Championship. It provided more competitive opportunities for teams from emerging regions while maintaining a high bar for entry into the main event.

The event also demonstrated the viability of hosting major League of Legends competitions in South America, expanding the game's global footprint. The structural changes, particularly the new qualification path for wildcard regions, helped to formalize and improve the competitive structure for leagues outside the traditional major regions.