When did the club UNAM played the first season in top division?
CREATE TABLE table_18143210_2 (first_season_in_top_division VARCHAR, club VARCHAR)
SELECT first_season_in_top_division FROM table_18143210_2 WHERE club = "UNAM"
### Context: CREATE TABLE table_18143210_2 (first_season_in_top_division VARCHAR, club VARCHAR) ### Question: When did the club UNAM played the first season in top division? ### Answer: SELECT first_season_in_top_division FROM table_18143210_2 WHERE club = "UNAM"