Currently, the only odds I've seen offered are for the following Welterweight fight:

BJ Penn +155
VS.
Matt Hughes -185

The last time these two fought, Penn pulled off an incredible upset. Since then, Hughes has been a dominant force in MMA, while Penn has been somewhat under the radar (mainly due to his not fighting in the UFC for some time).

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"You gonna bark all day, little doggie, or are you gonna bite?" - Mr. Blonde from Reservoir Dogs