CREATE TABLE table_57431 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

What team played South Melbourne at their home game?
SELECT "Away team" FROM table_57431 WHERE "Home team" = 'south melbourne'
SELECT "Away team" FROM "table_57431" WHERE "Home team" = 'south melbourne'