Latin America South Closing Cup is one of the two premier League of Legends professional circuits in Latin America.

The 2018 opening season of the league consists of three stages of play. The first one is the promotion tournament where the second bottom team of the 2017 closing cup regular season will defend their spot for the opening cup against the 2nd team of the challenger circuit in Latin America South.

The second stage is the regular season where the winners of the promotion tournament joins all the teams that get to keep their spot from the previous season in a double round robin group stage. The bottom team gets auto-relegated and the second to last will defend its spot in the 2018 CLS Closing Promotion match.

The third and final stage is the playoffs where the top four of the regular season will play for a spot in the 2018 Mid-Season Invitational play-in.

The total prize pool of the tournament is yet to be disclosed.