UFC 137 Video: Watch Brief Scuffle between B.J. Penn and Nick Diaz at Weigh-Ins

UFC 137 goes down tomorrow night at the Mandalay Bay Events Center in Las Vegas, and the card will feature a main event between former UFC champion B.J. Penn and former Strikeforce champion Nick Diaz.

Diaz is currently riding a 10-fight win streak, while Penn is 1-2-1 in his last four fights. Penn was last seen earning a hard-fought draw against No. 2 welterweight Jon Fitch. Diaz's most recent fight came against heavy-handed striker Paul Daley, who he knocked out in the first round.

Complete Weigh-In Results:

MAIN CARD (Pay-per-view)

Nick Diaz (170) vs. B.J. Penn (169)

Cheick Kongo (234) vs. Matt Mitrione (255)

Mirko "Cro Cop" Filipovic (235) vs. Roy Nelson (252)

Hatsu Hioki (145) vs. George Roop (145)

Jeff Curran (134) vs. Scott Jorgensen (135)

PRELIMINARY CARD (Spike TV)

Donald Cerrone (156) vs. Dennis Siver (155)

Tyson Griffin (149)* vs. Bart Palaszewski (146)

*Griffin fined 25 percent of his purse for missing weight. Bout to be fought at catchweight of 148 pounds.

PRELIMINARY CARD (Facebook)

Eliot Marshall (204) vs. Brandon Vera (205)

Danny Downes (155) vs. Ramsey Nijem (155)

Chris Camozzi (185) vs. Francis Carmont (185)

Dustin Jacoby (185) vs. Clifford Starks (186)