In the battle for TRT bragging rights, we already have an early favorite.

Former middleweight number one contender Chael Sonnen (27-12-1), who ditched his digs at 185 pounds, is moving up a class to test his might against former Light Heavyweight Champion Forrest Griffin (19-7).

Again.

The test twins first went to war nearly 10 years ago under the International Fighting Championship (IFC) banner on September 6, 2003 from the Pepsi Center in Denver, Colorado. Yes, Sonnen tapped to a triangle choke and yes, Sonnen is also the one moving up in weight.

He's still the -300 favorite.

That might have more to do with Griffin's apparent decline over the past few years. After coughing up his 205-pound strap to Rashad Evans at UFC 92, he went on to get his ass kicked by Anderson Silva, a middleweight, at UFC 101. Since then, he's won a pair of decisions over Tito Ortiz, as well as one over Rich Franklin.

And he was knocked out in a rematch against Mauricio Rua.

Following the revelation that he was on testosterone replacement therapy (TRT) following his most recent win at UFC 148, Ultimate Fighting Championship (UFC) President Dana White called for the original Ultimate Fighter (TUF) champ to retire.

That call has not been returned.

Sonnen also had himself turned inside out by "The Spider," but outside a pair of losses to the Brazilian deity, the "American Gangster" has won his last five. With the exception of a close call against fellow contender Michael Bisping, he's looked dominant in each of those wins.

Enough to jump out as the early favorite for their UFC 155 scrap on Dec. 29 in Las Vegas, leaving Griffin in the dust at +220.

Anyone think the bookies are drinking the Kool-Aid? Or do these lines look accurate to you, as a fight fan, based on recent performances?