CREATE TABLE table_75394 ("Game" FLOAT, "March" FLOAT, "Opponent" TEXT, "Score" TEXT, "Record" TEXT, "Points" FLOAT)

Which Opponent has a Record of 45 21 4?
SELECT "Opponent" FROM table_75394 WHERE "Record" = '45–21–4'
SELECT "Opponent" FROM "table_75394" WHERE "Record" = '45–21–4'