CREATE TABLE table_5882 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Location" TEXT)

Who was the opponent that led to a record of 23-5?
SELECT "Opponent" FROM table_5882 WHERE "Record" = '23-5'
SELECT "Opponent" FROM "table_5882" WHERE "Record" = '23-5'