CREATE TABLE table_9616 ("Date" CLOB, "Round" CLOB, "Opponent" CLOB, "Venue" CLOB, "Result" CLOB, "Attendance" FLOAT, "Scorers" CLOB)

What team was the opponent when the round was sf?
SELECT "Opponent" FROM table_9616 WHERE "Round" = 'sf'
SELECT "Opponent" FROM "table_9616" WHERE "Round" = 'sf'