CREATE TABLE table_203_20 (id DECIMAL, "player" TEXT, "year" DECIMAL, "round" TEXT, "result" TEXT, "opponent" TEXT)

who was the last to win against his opponent ?
SELECT "player" FROM table_203_20 WHERE "result" = 'won' ORDER BY id DESC LIMIT 1
SELECT "player" FROM "table_203_20" WHERE "result" = 'won' ORDER BY "id" DESC NULLS LAST LIMIT 1