Main card: Nick Diaz (169.5) vs. Evangelista "Cyborg" Santos (169.5) [WW title] Ronaldo "Jacare" Souza (184.25) vs. Robbie Lawler (184) [MW title] Herschel Walker (220.75) vs. Scott Carson (214) Roger Gracie (206) vs. Trevor Prangley (205.25) "Strikeforce: Diaz vs. Cyborg" weigh-in results via Bloodyelbow.com

Fedor Emelianenko will return to the Strikeforce cage on Feb. 12, as he takes on Antonio Silva in a heavyweight main event from the Izod Center in East Rutherford, N.J... A match between former UFC heavyweight champions Andrei Arlovski and Josh Barnett is also said to be in the works for the February date. It remains to be seen how the New Jersey Athletic Control Board handles the licensing situation Barnett -- who allegedly tested positive for a performance enhancing substance prior to a scheduled bout with Emelianenko in the summer of 2009 -- is dealing with in California. His hearing before the California commission was pushed back at their Dec. 2 meeting. As speculated, Strikeforce will indeed hold an eight-man heavyweight tournament in 2011, and Emelianenko-Silva and Arlovski-Barnett are set to serve as quarterfinal bouts. Though the remaining combatants could not be confirmed, a third quarterfinal matchup between Fabricio Werdum and Brett Rogers is expected to take place in Columbus, Ohio, on a planned March 5 event. A fourth and final tournament bout is also set to take place on the March card. Semi-final and final bouts would then be held later in the year at to-be-announced events.

Sherdog.com

Randy Couture and Lyoto Machida have verbally agreed to meet at UFC 129 on April 30 in Toronto, MMA Fighting has learned from sources close to the fight. Couture also confirmed the fight when asked by MMA Fighting at UFC 125 on Saturday night.

MMAFighting.com

Thanks to everybody who's been tweeting about seeing my fights I must have missed the memo :) I think I'm at the end of it Yall . It's time.

Did UFC Hall of Famer Randy Couture Just Announce His Retirement Via His Twitter Account?

"The Ultimate Fighter 12 Finale" Fight Night Bonuses ($30,000 each): Fight of the Night: Leonard Garcia vs. Nam Phan Knockout of the Night: Pablo Garza Submission of the Night: Cody McKenzie

Kevin Iole's Twitter

Daniel Cormier will be back in action come January. The former Olympic freestyle wrestler will reportedly headline a to-be-announced Strikeforce Challengers event on Jan. 7, squaring off against Devin Cole in the show's main event. The news was first reported by Five Ounces of Pain, and Sherdog has confirmed the report with sources close to the matchup.

HT: Sherdog.com

After two failed attempts to pit Jorge Rivera and Alessio Sakara in a middleweight contenders bout ended without the two ever squaring off, the UFC is moving on from the proposed matchup. Rivera will have a significantly higher-profile bout the next time around. He will face Michael Bisping at UFC 127 on February 27, the Massachusetts fighter told Kimura.se in a video interview just hours after his match with Sakara was scratched at UFC 122.

MMAFighting.com

WEC 52 Fight Night Bonuses ($10,000 each): Fight of the Night: Cub Swanson vs. Mackens Semerzier Knockout of the Night: Erik Koch Submission of the Night: Urijah Faber

MMAJunkie.com

UFC 121 Bonuses ($70K each): Fight of the Night: Diego Sanchez vs. Paulo Thiago Submission of the Night: Daniel Roberts Knockout of the Night: Cain Velasquez

UFC's Twitter

Herb Dean to ref the Brock Lesnar vs Cain Velasquez fight. Good man. Honorable ref.

Brock Lesnar adviser Paul Heyman on Twitter