Why does the clock disappear in the last ten seconds in boxing?

Answer 1

If a boxer gets knocked down or is unable to defend himself from his opponent in the last ten seconds of a round, the referee will begin a ten-count. In most matches, a knocked-down boxer cannot be "saved by the bell;" that is, the ten-count will continue even if the clock has wound down. So the round could conceivably end past the last ten seconds when there is a knock-down or standing ten-count. That is why the clock disappears in the last ten seconds.