Each day, The MMA Corner will provide a recap of results, event announcements, fight matchups, and injuries/cancellations from throughout the world of MMA.

Welterweight contenders Nick Diaz and B.J. Penn both made weight before having to be separated after getting physical in a staredown. The former champions will meet in the main event of UFC 137, which will take place at the Mandalay Bay Events Center in Las Vegas.

Main Card

Nick Diaz (170) vs. B.J. Penn (169)
Matt Mitrione (255) vs. Cheick Kongo (234)
Roy Nelson (252) vs. Mirko Filipovic (235)
George Roop (145) vs. Hatsu Hioki (145)
Jeff Curran (134) vs. Scott Jorgensen (135)

Preliminary Card

Donald Cerrone (156) vs. Dennis Siver (155)
Bart Palaszewski (146) vs. Tyson Griffin (149*)
Eliot Marshall (204) vs. Brandon Vera (205)
Danny Downes (155) vs. Ramsey Nijem (155)
Francis Carmont (185) vs. Chris Camozzi (185)
Dustin Jacoby (185) vs. Clifford Starks (186)

* – Palaszewski has agreed to fight Griffin in a catchweight bout. Griffin will be fined.

On Friday, Bellator welterweight champion Ben Askren and challenger Jay Hieron hit their marks at the weigh-ins for their title fight at Bellator 56. The fight will headline an event that also includes the semifinals of a heavyweight tournament. Bellator 56 will be held at Memorial Hall in Kansas City, Kan., on Saturday night.

After going nearly a decade without visiting Brazil, the UFC is now set to visit the country twice in a six-month period. On Friday, MMA Junkie reported that the UFC has booked a return to HSBC Arena in Rio de Janeiro. The venue will play host to UFC 142 on Jan. 14, 2012. No fights are currently booked for the event, but stay tuned to The MMA Corner for the latest on this event.

Photo: Nick Diaz (Josh Hedges/Zuffa LLC)