UFC 109: Relentless is an upcoming mixed martial arts event to be held by the Ultimate Fighting Championship (UFC) on February 6, 2010 at the Mandalay Bay Events Center in Las Vegas, Nevada.  LIVE on Pay per view.  Check your local listings.

A previously rumoured bout between Renzo Gracie and Matt Hughes will not take place on this card, but is taking place at UFC 112.

A Middleweight Championship bout between Anderson Silva and Vitor Belfort was confirmed by UFC President Dana White,though it was contingent on Silva's successful recovery from elbow surgery. Subsequently, the fight was rescheduled due to Silva's continued slow healing from surgery. The Silva vs. Belfort bout is to take place at UFC 112.

Antônio Rogério Nogueira had to withdraw from his bout against Brandon Vera due to a fractured ankle.It was announced that Vera will face Jon Jones on March 21, 2010 at UFC on Versus 1: Vera vs. Jones.

Josh Koscheck was scheduled to face Paulo Thiago, but was forced off the card with an injury. Mike Swick has stepped in as Koscheck's replacement and will now fight Thiago.

The bout between Randy Couture and Mark Coleman was originally scheduled for UFC 17 in 1998, but a Couture injury forced the cancellation of the bout. Nearly twelve years later, this bout headlines UFC 109.

Mostapha Al-turk has run into visa issues that could prevent the British fighter from making the trip to Las Vegas for the upcoming fight.Both Jon Madsen[11] and Joey Beltran[12] were pegged as possible late replacements to step in and fight Rolles Gracie, before Beltran got the nod as the replacement fighter against Gracie.

Dana White has also announced that the winner of the Nate Marquardt and Chael Sonnen fight will receive a shot at the middleweight championship against the winner of the Silva/Belfort fight at UFC 112.

Main Card

Light Heavyweight bout: Randy Couture vs.Mark Coleman
Middleweight bout:  Nate Marquardt vs.  Chael Sonnen
Welterweight bout: Mike Swick vs.  Paulo Thiago
Middleweight bout:  Demian Maia vs.  Dan Miller
Welterweight bout:  Matt Serra vs.  Frank Trigg

Preliminary Card (Spike TV)

Lightweight bout:  Mac Danzig vs.  Justin Buchholz
Lightweight bout:  Melvin Guillard vs.  Ronnys Torres

Preliminary Card

Lightweight bout:  Phillipe Nover vs.  Rob Emerson
Light Heavyweight bout:  Brian Stann vs.  Phil Davis
Heavyweight bout:  Tim Hague vs.  Chris Tuchscherer
Heavyweight bout:  Rolles Gracie vs.  Joey Beltran[