The UFC has two legendary welterweights facing off in the main event of UFC 137 on Saturday night as B.J. Penn takes on Nick Diaz.

Penn is a former UFC welterweight and lightweight champion while Nick Diaz was the Strikeforce welterweight champion prior to leaving the organization for greener pastures.

Penn (16-7-2) comes into this three-round contest as the favorite over Diaz (26-7-1), as Penn has odds of -125 to top Diaz, who has a money line of -105. Both fighters have similar styles as each relies on boxing and jiu-jitsu to win fights. Penn may have the edge in regards to wrestling, but Diaz will have a big size edge in terms of mass and reach. Both fighters will be sure to leave everything in the octagon, which makes this fight very interesting.

The co-main event also has a very competitive contest as heavyweights Cheick Kongo (26-6-2) and Matt Mitrione (5-0) face off with the winner emerging as a top-10 contender in the division.

Mitrione is the slight favorite, with a money line of -140 while Kongo has odds of +110 to win. Both fighters are primarily strikers, but Mitrione packs the harder punch and is more mobile while Kongo has a slightly better ground game. Mitrione will look to keep the fight standing and stick-and-move while Kongo will look to utilize leg kicks and takedowns to finish the fight with ground-and-pound.

For complete UFC 137 betting odds, check out the jump.

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