Overshadowed by Saturday’s CBS-televised “Fedor vs. Rogers” event, Strikeforce tonight hosts Strikeforce Challengers 4: Evangelista vs. Gurgel in Fresno, California. The Showtime-televised card is headlined by undefeated lightweight Billy Evangelista vs. UFC veteran Jorge Gurgel.

Dan Henderson, a former PRIDE title-holder and current middleweight contender, has likely signed with Strikeforce, UFC President Dana White recently told Yahoo Sports. According to the report, a source close to the situation confirmed Henderson had signed with Strikeforce and White echoed the news, though Strikeforce’s Scott Coker denied a deal is done.

Will Kerr has been tapped to make his WEC debut as a late-replacement for an injured Alex Karalexis, taking on fellow newcomer Kamal Shalorus at WEC 44 on November 18 in Las Vegas.

Karalexis was forced to withdraw from the bout due to a hand injury, according to the WEC’s announcement. A timeline for his return was not released.

Heavyweight challenger Shane Carwin confirmed on his official website today that UFC champion Brock Lesnar will be unable to defend his title at UFC 108 on January 2 in Las Vegas.

“My manager Jason Genet just told me that UFC 108 is not happening,” wrote Carwin. “Brock has Mono and what the UFC has told me is that I have earned the title shoot but I have to wait for the title holder.”

Under Armour, the Baltimore-based leader in performance apparel and footwear, announced today it has signed Mixed Martial Arts Welterweight Champion Georges St-Pierre to a multi-year endorsement deal.

St-Pierre, the 2008 Sportsnet Canadian Athlete of the Year, will serve as the face of Under Armour’s Underwear, one of the company’s most popular items, and will be featured in its multi-platform media campaign beginning this holiday season.

Mirko “Cro Cop” Filipovic and Ben Rothwell could square off at UFC 110, according to a post on The Underground, with both heavyweights looking to rebound from recent losses at the February 20 card in Sydney, Australia.

UFC 110, which has yet to be officially announced, is expected to be co-headlined by Wanderlei Silva’s middleweight debut against Yoshihiro Akiyama.

UFC heavyweight champion Brock Lesnar will be unable to fight Shane Carwin in the main event of UFC 108 on January 2, according to Heavy.com, likely leaving the traditional blockbuster event without a championship headliner.

Illness prevented Lesnar from fighting at UFC 106 later this month and the fight was targeted for UFC 108, but with Lesnar still sidelined the bout will again be delayed, likely to UFC 109 on February 6.

On the eighth episode of The Ultimate Fighter 10, Team Rampage’s Marcus Jones looked to advance to the quarterfinals and prevent Team Rashad from going undefeated as he took on Mike Wessel in the tournament’s final opening round fight. Also on the episode, the matchups were determined for the next round of fights.

Heavyweight contenders Cain Velasquez and Antonio Rodrigo Nogueira will likely meet in a featured matchup at UFC 108 on January 2 in Las Vegas, according to Tatame, which cites a report from Nogueira’s manager Ed Soares.

Velasquez is coming off a second-round knockout of Ben Rothwell at last month’s UFC 104, while Nogueira earned an impressive decision over Randy Couture in August.