- After she defeated Sara McMann recently, many were left to wonder who could be next for Ronda Rousey. The UFC women's bantamweight champ has run through all challengers presented to her so far, and she's coming very close to cleaning out her division. However, according to a teaser announcement from UFC color commentator Joe Rogan, Rowdy may not have to wait much longer to find a fresh challenge.

"I wish I could tell you what I know. I know some secret stuff," Rogan said in a recent appearance on KROQ. "I can say no more than I've already said. I will tell you this, within the next week or so, a huge announcement will come about women's fighting. It's gonna be madness."

Many have speculated that the announcement could be the signing of either Holly Holm or Cristiane "Cyborg" Justino, who present Rousey's toughest challenges outside of the UFC.

- The UFC has announced that former heavyweight champion Junior dos Santos will be facing off against Stipe Miocic in the co-main event of the upcoming UFC 173 fight card.

Dos Santos is coming off of a loss to current champ Cain Velasquez in a title fight that took place last October. After suffering his first professional loss to Stefan Struve in 2012, Miocic has won two straight, earning decision wins over Roy Nelson and Gabriel Gonzaga.

UFC 173 takes place at the MGM Grand Garden Arena in Las Vegas on May 23 and will feature a main event between UFC middleweight champ Chris Weidman and Lyoto Machida.

- On the heels of three straight losses, The Ultimate Fighter 6 winner Mac Danzig has announced his retirement from mixed martial arts. The cerebral fighter released a comprehensive and very respectable statement recently, of which you can read an excerpt from below. For the full statement, check out Danzig's Tumblr.

"After 13 years of competing in MMA, and 7 years of competing in the world's premiere high-level organizations, I have finally decided to retire from professional fighting. This decision has been a long time coming, spawned by a myriad of reasons (I'll touch on just a few here), and should come as no real surprise to most of you who have followed my career closely.

"Working for the UFC over the past 7 years has been a spectacular privilege, for which I am truly grateful. During dark times, even when some fans began to write me off, Joe Silva looked at my record for what it really was, not simply a numbers game, and continued to give me the opportunity to fight on the world stage for the best organization out there. This has been an awesome lesson in perseverance for me.

"It has been a long, amazing, arduous, thrilling, painful, depressing, spectacular, self-realizing, worthwhile struggle of a journey, for which I have no regrets. I have accomplished a lot in the sport, especially thanks to the many opportunities the UFC has given me. The competition level that I reached is far beyond what I ever imagined being able to do when I first set out to be a fighter in the year 2000. That being said, in hindsight, my enthusiasm and motivation for competition definitely reached it's peak around 2008 (after 7 years prior of toiling in the minor professional leagues) and it's been an uphill battle ever since."

The 34-year-old retires with a record of 21-12-1.

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