CREATE TABLE table_57177 ("Date" CLOB, "Opponent" CLOB, "Score" CLOB, "Loss" CLOB, "Attendance" FLOAT, "Record" CLOB)

What was the opponent for july 21?
SELECT "Opponent" FROM table_57177 WHERE "Date" = 'july 21'
SELECT "Opponent" FROM "table_57177" WHERE "Date" = 'july 21'