Danny Garcia Bring On Manny Pacquiao I'll Knock His Ass Out

121613_danny_garcia_launchDanny Garcia -- boxing's light welterweight champ -- says he's ready to defend his title against any contenders ... and he tells TMZ Sports, he'd easily knock Manny Pacquiao out if he got the chance.

We spoke with the undefeated champ at a charity event at Cal State Northridge ... and asked him about the secrets to his success.  His answer: "God blessed me with these hammers." I.E. his fists. Pretty bad ass.

But the craziest part, Garcia says he'd gladly put his title belt on the line to knock out former champ Manny Pacquiao -- presuming Pacquiao doesn't end up challenging Floyd Mayweather Jr. first.

Check the clip ... "Swift" also has some important tax advice for Manny. Sounds like fightin' words to us.