CREATE TABLE table_24316 ("Competition" TEXT, "Round" TEXT, "Opponent" TEXT, "Result" TEXT, "Score" TEXT, "Home/Away" TEXT, "Venue" TEXT, "Attendance" TEXT, "Date" TEXT)

How many opponents did they play on 17/05/2009?
SELECT COUNT("Opponent") FROM table_24316 WHERE "Date" = '17/05/2009'
SELECT COUNT("Opponent") FROM "table_24316" WHERE "Date" = '17/05/2009'