CREATE TABLE table_4757 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

Who was home team South Melbourne's opponent?
SELECT "Away team" FROM table_4757 WHERE "Home team" = 'south melbourne'
SELECT "Away team" FROM "table_4757" WHERE "Home team" = 'south melbourne'