The 2017 Mid-Season Invitational was the third annual Mid-Season Invitational (MSI) - a tournament for the MOBA video game League of Legends was hosted by Riot Games. The tournament was held from April 28 to May 21, 2017, in Brazil. This was the first time MSI had been extended. Each of 13 premier League of Legends leagues had a team that won the Spring Split represent them; Europe (EU LCS), South Korea (LCK), and China (LPL) had their teams automatically admitted into the main event whereas the other 10 leagues competed among each other in a "Play-in Stage" with the top 3 teams advancing to join the main event.