Former welterweight champion B.J. Penn will welcome back Nick Diaz to the Ultimate Fighting Championship (UFC) in the main event of UFC 137 on Saturday, Oct. 29. Also, heavyweight sluggers Cheick Kongo, Roy Nelson, Mirko “Cro-Cop” Filipovic and Matt Mitrione will make their appearance on the main card. This entire card can be viewed on Pay-Per-View and the undercard can be viewed on network cable television and also on facebook.com/ufc.

B.J. “The Prodigy” Penn vs. Nick Diaz

B.J. Penn – Kailua, Hawaii, 5-9, 170 pounds, 16-7-2, former light and welterweight champion

Nick Diaz – Stockton, Calif., 6-0, 170 pounds, 26-7-1 current strikeforce welterweight champion

Two of the best grapplers and all-around mixed martial artists in the welterweight division will do battle this Saturday night. Both B.J. Penn and Nick Diaz have great standup and each holds a black belt in Brazilian Jiu-Jitsu. Diaz, the current Strikeforce welterweight champion, was scheduled to be in a title match with Georges St-Pierre to unify the welterweight belts. However, after Diaz failed to show up for two press conferences, the UFC brass felt Diaz wasn’t taking this seriously. They later made Carlos Condit the No. 1 contender until St-Pierre pulled out all together with a sprained knee.

This bout is about as even as it gets with the only advantage going to Diaz in conditioning.

Penn by Split Decision

Cheick Kongo vs. Matt Mitrione

Cheick Kongo – Paris, France, 6-4, 230 pounds, 26-6-2

Matt Mitrione – Springfield, Ill., 6-3, 265 pounds, 5-0-0

Two big men will do battle this Saturday night and that’s putting it lightly. Kongo with his technical kickboxing will look to keep the brawler Matt Mitrione moving backwards and off balance. Mitrione is undefeated and still very young to the sport, so this will be a huge opportunity for him. Only one of Mitrione’s fights has gone to a decision and I wouldn’t expect this one to fall to the judges hands either.

Mitrione by TKO (Strikes)

Mirko “Cro-Cop” Filipovic vs. Roy “Big Country” Nelson

Mirko Filipovic – Vinkovci, Croatia, 6-2, 220 pounds, 27-9-2

Roy Nelson – Las Vegas, 6-0, 263 pounds, 16-6-0, “The Ultimate Fighter” season 10 winner

Pride Fighting Championship legend Mirko Filipovic will have to win Saturday night to keep his job. Cro-Cop is 3-5 in the UFC and that’s not against elite competition. He’s strictly still here on name recognition alone, so he will have to do something pretty impressive to still be relevant in the UFC. Cro-Cop may be known for his highlight reel knockouts, but his opponent, Roy Nelson, possibly has the hardest head in all of mixed martial arts, just ask Junior Dos Santos. In 21 fights, Nelson has only been knocked-out once. Nelson will most likely take this fight to the ground. It may not look like it, but he is a high level black belt in Brazilian Jiu-Jitsu. Let’s just hope this one ends early.

Nelson by Submission (Kimura)

Scott “Young Guns” Jorgensen vs. Jeff “Big Frog” Curran

Scott Jorgensen – Payson, Utah, 5-4, 135 pounds, 12-4-0

Jeff Curran – Woodstock, Illi., 5-6, 135 pounds, 35-13-1

Jorgensen by Unanimous Decision

Hatsu Hioki vs. George Roop

Hatsu Hioki Nagoya, Japan, 5-11, 145 pounds, 24-4-2

George Roop – Tucson, Ariz., 6-1, 145 pounds, 12-8-1

Roop by Unanimous Decision

Undercard: Free on Network Cable T.V.

Tyson Griffin vs. Bart “Bartimus” Palaszewski

Griffin by Unanimous Decision

Dennis Siver vs. Donald “Cowboy” Cerrone

Cerrone by Split Decision

Undercard: Free on facebook.com/ufc

Brandon “The Truth” Vera vs. Elliot “The Fire” Marshall

Vera by TKO (Strikes)

Ramsey Nijem vs. Dan “Danny Boy” Downes

Danny Downes by Submission (Rear Naked Choke)

Chris Comozzi vs. Francis “Limitless” Carmont

Comozzi by TKO (Strikes)

Dustin Jacoby vs. Clifford Starks

Jacoby by Unanimous Decision