Alicia Moro
I'm surprised this actress didn't go on to have a bigger career. She really isn't bad at all in this film, especially during the fight scenes. It looks like she's had some martial arts or boxing training and is 100% believable with the stances and throws, though of course exaggerated for cinematic effect.
Considering she was a newcomer, I found she actually comes off a lot better than any of the other actors in the film, aside from the always reliable Italian character actors Venantino Venantini, Anna Orso, Luciano Pigozzi, and Eduardo Fajardo (all sadly underused).