CREATE TABLE table_54575 ("Home team" TEXT, "Home team score" TEXT, "Away team" TEXT, "Away team score" TEXT, "Venue" TEXT, "Crowd" FLOAT, "Date" TEXT)

For the Venue of western oval, what's the Away team playing?
SELECT "Away team" FROM table_54575 WHERE "Venue" = 'western oval'
SELECT "Away team" FROM "table_54575" WHERE "Venue" = 'western oval'