Boxer Jeff Horn says there's NO DOUBT in his mind he beat Manny Pacquiao -- telling TMZ Sports the WBO's rescoring of his July 2 fight proves he's the real-deal champ.
The Australian fighter just touched down in L.A. and told us he just found out the results of the WBO's review -- in which they had 5 independent judges from around the world rescore the fight without sound.
The judges scored the fight in favor of Horn -- and he told TMZ Sports the new information should silence his critics once and for all.