CREATE TABLE table_48590 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Record" CLOB, "Streak" CLOB)

who is the opponent when the streak is won 9 on april 13, 1990?
SELECT "Opponent" FROM table_48590 WHERE "Streak" = 'won 9' AND "Date" = 'april 13, 1990'
SELECT "Opponent" FROM "table_48590" WHERE "Date" = 'april 13, 1990' AND "Streak" = 'won 9'