CREATE TABLE table_72572 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Game site" TEXT, "Record" TEXT, "Attendance" FLOAT)

In week 9 who were the opponent?
SELECT "Opponent" FROM table_72572 WHERE "Week" = '9'
SELECT "Opponent" FROM "table_72572" WHERE "Week" = '9'