UFC 84 is a great event for sports betting aficionados like you and me because it features a number of competitive fights which could go either way. Overall, I haven't seen a card this ripe for underdog online betting wins in a while. Let's take a look, shall we?
BJ Penn (-250) vs. Sean Sherk (+185)
BJ is coasting on two dominating wins over guys like Jens Pulver and Joe Stevenson, but let me remind you of something: Jens Pulver is now fighting at featherweight while BJ Penn used to fight up to welterweight. That's a 25 pound difference. And while Joe Stevenson is pretty talented, I wouldn't place him in the same league as Penn and Sherk.
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