CREATE TABLE table_6048 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Save" CLOB)

What were the opponents from the April 13?
SELECT "Opponent" FROM table_6048 WHERE "Date" = 'april 13'
SELECT "Opponent" FROM "table_6048" WHERE "Date" = 'april 13'