MLS clubs are limited to the 18 teams that qualified for the playoffs last season, nine from each conference. Previously, the entirety of the competition was played in the United States and Canada, with Liga MX sides on the road for potentially over a month. The top four MLS clubs and the top four Liga MX clubs from Phase One will advance to the knockout rounds. Liga MX challengesNashville’s group opponents are pretty favorable, at least on paper. Atlético San Luis is in a similar position, winless in its first three Liga MX matches, losing to Cruz Azul and tying Tigres and Tijuana.