Not really. Rios is a brawler, and that probably isn't the best style to have against someone as fast and with knockout power like Paq. But that doesn't change the fact that I'll be rooting for Rios to finish Paq.
Yao would have to take him to the ground and sit on him or be able to grab him and choke him. Otherwise Pacquiao takes him out. He would just goes circles around him to get whatever shots he wants. Yao is too slow. <iframe width="420" height="315" src="//www.youtube.com/embed/e3mNxGMpa_w" frameborder="0" allowfullscreen></iframe>