Miguel Marriaga? Who? Put him in this site's search engine... never been mentioned.
Fella is 20-0 (18 ko's). Impressive. Although, of course, he hasn't beaten anybody - does have a half-decent win over a fella called Christopher Martin, who had never been stopped, and took Gary Russell jr the distance after getting smashed by Marriaga (fight is on youtube). But get this - he has two amateur wins over Walters. They're the same age.
Now obviously amateur results can be dramatically reversed in the pro's. Walters pro form is streets ahead of anything Marriaga has achieved plus he's in his pomp and a top P4P chinning merchant.
I expect he has improved past Marriaga and will blast him out but....
2. 90% KO ratio
3. Beat opponent before
4. Same age (so it's not an experienced amateur beating a novice)
Bookies make that fighter a 7/1 shot.