I say this fight ends in the championship rounds with Lopez gassing out and Marquez winning by OK
http://www.webdesign-guru.co.uk/icon/wp-content/uploads/ok.gif
I'm pretty sure it will go well beyond the 3rd round. It will end by KO though. Based on both guys performances, I say its going to be a KO past the 8th round when juanma gasses out.