Great fight for Mares he is an excellent prospect i've been saying for quite some time that he will be the future of the division just like Devon Alexander will for Jr Welterweright, and Roman Gonzalez for Strawweight. This will be an excellent boxing match both men are excellent counter punchers, but like VD said Mares is younger and fresher and has the speed advantage, so he will be able out speed and out counter Penelose to win a UD IMO.