CREATE TABLE table_203_598 (id DECIMAL, "date" TEXT, "time" TEXT, "opponent" TEXT, "site" TEXT, "tv" TEXT, "result" TEXT, "attendance" DECIMAL)

who was the last opponent ?
SELECT "opponent" FROM table_203_598 ORDER BY "date" DESC LIMIT 1
SELECT "opponent" FROM "table_203_598" ORDER BY "date" DESC NULLS LAST LIMIT 1