CREATE TABLE table_76320 ("Game" FLOAT, "January" FLOAT, "Opponent" CLOB, "Score" CLOB, "Record" CLOB)

Who was the opponent with the record of 15-21-6?
SELECT "Opponent" FROM table_76320 WHERE "Record" = '15-21-6'
SELECT "Opponent" FROM "table_76320" WHERE "Record" = '15-21-6'