I'd certainly see it as one of the biggest upsets in a British ring anyway , I'm giving him absolutely no chance .
Yes Rees is an underdog, but M'Baye is hardly the second comming. It would be a suprise if Rees won, but hardly a huge suprise IMO.
Rees is decent if very lucky to be in this position. I do not think he will win but would not be overly surprised. I do not reckon too much to MBaye really.