CREATE TABLE table_49699 ("Date" CLOB, "Round" CLOB, "Opponent" CLOB, "Venue" CLOB, "Result" CLOB, "Attendance" FLOAT)

Which opponent had a round of SF?
SELECT "Opponent" FROM table_49699 WHERE "Round" = 'sf'
SELECT "Opponent" FROM "table_49699" WHERE "Round" = 'sf'