This is the interesting one...certainly a conversation starter. Odds on this fight (also scheduled for the second week of April), are a bit controversial as it seems the odds are subject to some degree to the location of the fight. Speculation and criticism abounds that Japan (famously the home of PRIDE) may yet be the destination for the second half of the quarterfinal stage. Consistent steroid rumors have dogged "The Reem," and both Barnett and Overeem would be seen as the odds on favorites to benefit most from the total lack of serous testing in Japan.
Whether or not testing at this point would matter to any degree is surely an open debate. As it stands today, despite just recently beating the widely acknowledged greatest HW of all time (Fedor), and also having a win vs. Overeem already in the bank. Incredibly.... Werdum stands at +250 across the board. You'll have to lay out $300 to win $100 on Overeem. What does a Brazilian have to do get some respect around here!?
Interestingly, there are some slim odds that Alistair Overeem would at some point, need to beat down his brother Valentijn on the way to claiming the Heavyweight Grand Prix Championship. There are a series of unlikely, yet not impossible scenarios, which must arise before this could ever materialize, but that doesn't mean the possibility isn't fascinating. Odds on this scenario becoming a reality: Ridiculous. Don't bother calculating.
J.Wise / Guerrilla Fight
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