CREATE TABLE table_name_57 (home__2nd_leg_ VARCHAR)

What was the score on the first leg when gimnasia de mendoza played at home for the second leg?
SELECT 1 AS st_leg FROM table_name_57 WHERE home__2nd_leg_ = "gimnasia de mendoza"
SELECT 1 AS "st_leg" FROM "table_name_57" WHERE "gimnasia de mendoza" = "home__2nd_leg_"