CREATE TABLE table_75526 ("Res." TEXT, "Record" TEXT, "Opponent" TEXT, "Method" TEXT, "Event" TEXT, "Round" FLOAT, "Time" TEXT)

What opponent uses the method of decision and a 5-3 record?
SELECT "Opponent" FROM table_75526 WHERE "Method" = 'decision' AND "Record" = '5-3'
SELECT "Opponent" FROM "table_75526" WHERE "Method" = 'decision' AND "Record" = '5-3'