LAS VEGAS — Manny Pacquiao turned in perhaps the most dominating performance of his career Saturday night, knocking Ricky Hatton down twice in the first round before finally stopping him with a ferocious left hand in the final seconds of the second round.

Pacquiao showed why he is considered the best pound-for-pound fighter in the world with a stunning knockout that left Hatton lying motionless on his back in the middle of the ring.

Hatton had lost only once in his career, but he was no match for Pacquiao, who knocked him down midway through the first round and again towards the end of the round.

Hatton regrouped and made it through most of the second round before a chopping left hand sent him sprawling at 2:59 of the second round.