CREATE TABLE table_51431 ("Athlete" TEXT, "Event" TEXT, "Round of 32" TEXT, "Round of 16" TEXT, "Quarterfinal" TEXT, "Semifinal" TEXT, "Final" TEXT)

What is the final for middleweight 75 kg?
SELECT "Final" FROM table_51431 WHERE "Event" = 'middleweight –75 kg'
SELECT "Final" FROM "table_51431" WHERE "Event" = 'middleweight –75 kg'