Ronda Rousey -- I'll Beat Laila Ali In Boxing ... Just Lemme Train

Ronda Rousey says she's VERY CONFIDENT she could beat Laila Ali in a boxing match -- telling TMZ Sports she just needs some time to learn the ropes.

It's no joke ... Ronda was out in NYC Monday when we asked how she felt about the undefeated former boxing champ's recent call-out ... when Laila told us no woman alive could take her in the ring.

But Ronda begs to differ ... saying she'd wreck Muhammad Ali's daughter -- even if the fight didn't go to the mat, where Ronda would clearly have the advantage (arm bar anyone?!).

Ronda also had some tough talk for Houston Texans cheerleader Antonieta Osuna -- a former boxer who recently told us she wants a piece of the UFC champ too.

Check out the clip -- Rousey says it's not just her insane athletic skills that would propel her to victory, it's her championship mentality.