CREATE TABLE table_63253 ("Game" CLOB, "Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Location/Attendance" CLOB, "Record" CLOB)

Who was the opponent on April 21?
SELECT "Opponent" FROM table_63253 WHERE "Date" = 'april 21'
SELECT "Opponent" FROM "table_63253" WHERE "Date" = 'april 21'