In PR:
Ivan Calderon (32-0-1, 6 KOs) vs Giovani Segura (24-1-1, 20 KOs) - WBO and WBA (Super) light flyweight titles
This is on Integrated Sports PPV, but I remember there are sometimes legal streams of Calderon's fights (PR Best Boxing) for purchase.
I think there was a period in early 2007 where I thought Calderon was better than everyone. He was so hard to pin down and, though they weren't strong, his crisp, clean punches covered his tracks beautifully.
But it's been a few years since then: he's older, slower, and gets caught quite a bit now. (Esp. with headbutts -- three of his last four fights have stopped due to accidental ones.) I haven't seen Segura but his high KO percentage stands out, esp. against others at these lower weights.
The WBA champion becomes a "super" champion when he unifies his belt with another world title. (WBO light flyweight.) Calderon's Ring Magazine junior flyweight title is also on the line. Segura's rated #1 by the magazine's panel.
In Argentina:
Marcos Maidana (28-1, 27 KOs) v. DeMarcus Corley (37-13-1, 22 KOs) - WBA light welterweight title
I think it's easy to call this for Maidana as he's fighting at home. I am not a big fan of Maidana's technique, but, for the sake of the light welterweight division, hope he has success for as he's one of the big players at that weight. For the sake of children, I hope nice things to happen Chop-Chop (like a winning lottery ticket or something) because he's apparently taking care of 14 kids. (I read seven are from his brother, who passed away.)