For Sam Stout, who was a brother-in-law and training partner with Tomkins, the impact has been even greater.

MMAJunkie.com confirmed that Stout has withdrawn from his fight with Dennis Siver at UFC 137 on Oct. 29 and former WEC star, Donald Cerrone, will fill in.

Donald Cerrone (16-3 MMA, 3-0 UFC) has stepped in for Sam Stout (17-6-1 MMA, 6-5 UFC) and now meets Dennis Siver (19-7 MMA, 8-4 UFC) at October’s UFC 137 event.

As MMAjunkie.com (www.mmajunkie.com) first reported earlier today, Stout recently withdrew from the event for undisclosed reasons. Event sources confirmed the opponent switch.

Fellow lightweight Cerrone now takes his spot on the card and fights for the fourth time in 2011.

Cerrone is 3-0 in the UFC and is coming off a first-round TKO of Charles Oliveira at UFC Live 5 earlier this month.

Siver has won his last four, including a close decision victory over Matt Wiman back at UFC 132 in July.

The winner of this contest will quickly emerge as one of the top contenders in the lightweight division.

Considering the log jam that is the UFC lightweight division, I thought it might be a good idea for the UFC to consider a lightweight grand prix to crown an undisputed champion. Before I unveil my quarterfinal matchups, consider that I kept any fights that are already in the works and am using just UFC fighters, not Strikeforce.

So, without further ado, here are my quarterfinals:

Frankie Edgar vs. Gray Maynard – I would have all the fights in the tournament be five round contests, so it wouldn’t take away from this planned trilogy bout. While many might think this could be the finals, why not just let these two settle the score.

Jim Miller vs. Benson Henderson – Again, these two are already signed up to fight. Miller is the expected No. 1 contender in waiting while Henderson is right on the border of being a top-5 lightweight in the UFC. This should be a great grappling contest.

Anthony Pettis vs. Melvin Guillard – Who wouldn’t want to watch these two trade blows? Despite both being strikers, each has very different styles. There will be a lot of fireworks and probably a KO of some sort.

Clay Guida vs. Dennis Siver – Guida and Siver have both established their cases to move up the contender ladder. Guida may have the wrestling to neutralize Siver, while Siver has the striking ability to best Guida. It would be a great contest between two legit lightweight contenders.

UFC 132 took place last night and was one of the most entertaining PPV’s I have seen in quite some time.

There were so many storylines that emerged from the event, but I guess I will have to start with the main event.

Dominick Cruz and Urijah Faber put on quite a show, proving that bantamweights can headline a PPV. In the end, Cruz won a close unanimous decision that had Faber crushed and Cruz looking very joyous and relieved (AP Photograph).

I personally felt Cruz won 48-47 based on scoring rounds, but I don’t feel like the fight had a true winner or loser. I didn’t think Faber did enough to warrant winning the title, but I think he should be considered for an immediate rematch.

Faber’s quickness did nullify some of Cruz’ movement, but Cruz still seemed to dictate the pace and style of the fight. The ground scrambles were really impressive from both men and that essentially made the fight a standup battle, where Cruz landed a lot more strikes.

In the co-main event, Chris Leben defeated Wanderlei Silva by KO in just 27 seconds. Coming in, many thought Tito Ortiz would be fighting his last fight, but it may have been Silva that did, as he suffers another big time KO and is just 2-6 in his last eight fights.

I don’t know what this means for Leben, but he certainly recovered well from his loss to Stann earlier this year.

Perhaps the biggest thing to happen Saturday was Ortiz’ very surprising submission of Ryan Bader in the first round.

Ortiz caught Bader with a big right hand and then followed up with a guillotine choke to get the win. With his career on the line, Ortiz was not surprisingly quite emotional after the victory. He pulled out his famous “grave digger” celebration, which I thought was a little much. There is the old adage about acting like you have been there before, but I guess when you haven’t won a fight in five years, you never know when you will get a chance to win again.

Bader has now lost two in a row and has a long road to get back to top contender status. Ortiz deserves another big name for his next fight and we will see how far he can take this.

In other bouts, Carlos Condit had a very impressive KO win over previously unbeaten, Dong Hyun Kim. I expected Kim to use his size and strength to out-grapple Condit, but “The Natural Born Killer” never let that happen, landing big strikes early and often before using a flying knee to setup the victory. Condit quietly requested a title shot after the fight, but he probably has another win or two to go to seal that up.

In a controversial lightweight decision, Dennis Siver beat Matt Wiman. Siver won 29-28 on all three cards. Wiman was noticeably upset after the fight and stormed off, but I personally thought Siver won rounds one and three and Wiman clearly won round two. I don’t think Wiman can honestly say that he clearly won that fight.

Another impressive showing on the night came from lightweight Melvin Guillard, who scored a first round KO of Shane Roller. Guillard is on a role now and fighting with a lot of confidence. He is knocking on the door for a title shot. I personally would enjoy seeing a fight with him and Anthony Pettis.

The main card features five exciting bouts and here are my picks for the contest.

UFC Bantamweight Championship – Dominick Cruz (17-1) vs. Urijah Faber (25-4) – In this rematch I see Cruz winning by unanimous decision. His movement and wrestling will be too much for Faber to deal with. Cruz is a much different fighter than the one that met Faber before and I expect his footwork to pose problems for Faber and his explosive takedowns will be too much for Faber to stuff.

Middleweight Bout – Wanderlei Silva (33-10-1) vs. Chris Leben (21-7) – In this battle of strikers, I like Silva as I think his striking is a little more diverse. I think Silva’s chin is a little weaker, but I expect Silva to land the big punch first. Leben has a big heart, but he has struggled against strikers in the past. Look for Silva to win by second round TKO.

Light Heavyweight Bout – Tito Ortiz (16-8-1) vs. Ryan Bader (12-1) – This should be Ortiz’ final bout with the UFC as I see Bader winning by decision. I think the fight should be competitive, but Bader’s athleticism and combination of wrestling and striking should be too much for Ortiz, who will have to score takedowns in order to win.

Welterweight Bout – Carlos Condit (26-5) vs. Dong Hyun Kim (14-0-1) – This should be a very close fight, but I like Kim to remain unbeaten. His size and strength should be too much for Condit. I see Kim putting his weight on Condit against the fence and then scoring some judo throws and takedowns to control Condit. Look for Kim to win by decision.

Lightweight Bout – Dennis Siver (18-7) vs. Matt Wiman (13-5) – Siver is a short, compact striker that is hard to get to the ground because of his low center of gravity. I see Wiman struggling to get the fight to the ground, and that will allow Siver to out-point Wiman with his striking. My pick is Siver by decision.

The top 10 list features a number of different styles and contenders, but each fighter could arguably beat everyone else on the list.

Still, here are my updated top 10 lightweight rankings.

1. Frankie Edgar (13-1-1) – Edgar holds on to the top spot as he still is the UFC champion. An injury kept him from facing Gray Maynard in their long-awaited trilogy fight, but those two should collide soon and be able to settle the score as to who deserves to be the champion.

2. Gray Maynard (10-0-1) – Maynard is still unbeaten but missed out on his opportunity to win the championship when he had Edgar beaten at UFC 125. Now, he will have to wait for a third shot at Edgar this fall where he can perhaps prove to the world that he is the top lightweight in the world.

3. Gilbert Melendez (19-2) – Melendez could legitimately compete for the UFC title, but he hasn’t had the opportunity to do so. Now that the UFC is tapping into Strikeforce, perhaps a champion vs. champion bout is in the near future. Until then, Melendez looks as if he will continue to tear up Strikeforce competition.

4. Jim Miller (20-2) – Miller appears to be the No. 1 contender in the UFC due to Clay Guida beating Anthony Pettis this month. Miller has done nothing but win and now he gets a chance to showcase his talents on live TV when he faces Ben Henderson at UFC Live 5 in August. A win for Miller should certainly put him in line for a title shot.

5. Shinya Aoki (28-5, 1 NC) – Aoki is the top submission fighter in the lightweight division and he has won three straight by submission. A lackluster showing against Melendez forced Aoki to mature as a fighter and he is putting himself in line to be a force in the United States if he has the desire to compete in Strikeforce or the UFC.

6. Eddie Alvarez (22-2) – Alvarez, the Bellator champion, is a very polished fighter and the top fighter in all of the organization, in my opinion. There aren’t many challenges left for Alvarez, so hopefully he gets an opportunity soon to compete against the best Zuffa has to offer.

7. Clay Guida (29-11) – Guida had an impressive win over Anthony Pettis this month, as he scored takedowns to neutralize Pettis’ striking. Still one of the best the UFC has, Guida is looking to finally break through and earn a title shot. A few more wins may put him in line for just that.

8. Melvin Guillard (28-8-2) – Guillard appears to have his head on straight and is trying to become a complete fighter. He has won four straight and will face Shane Roller on Saturday, which will be a real test to see if he has learned from his past mistakes against submission specialists. A win for Guillard puts him in line to a get a top-5 contender in his next bout.

9. Dennis Siver (18-7) – Siver is also on a nice roll, winning his last three fights, including a decision over George Sotiropoulos, who was considered one of the top UFC lightweights coming into that contest. The kickboxer has good takedown defense and some powerful strikes. He will face off with Matt Wiman this Saturday.

10. Anthony Pettis (13-2) – Pettis suffered a decision loss to Guida, but even in a loss, he showed a very active guard and nearly found a way to pull out a win. Pettis really has the raw tools to be great, but fighting off his back won’t get him any victories. He is going to need to continue to improve on his grappling and find a way to keep fights standing, where he will have a striking edge on everyone he faces.

In the main event, UFC Bantamweight Champion Dominick Cruz is a slight favorite to beat challenger Urijah Faber. Cruz has odds of -130 while Faber has a money line of +100.

Faber is the only blemish on Cruz’ record, but Cruz is a much different fighter now and Faber has somewhat underwhelmed in his short time at bantamweight.

In the co-main event, Wanderlei Silva (-185) is favored to beat Chris Leben (+155) in what should be a slugfest in the middleweight division. Both men are standup fighters that like to trade punches. You would expect someone to get KO’d in this one.

Silva has the more impressive wins list, but his chin is not nearly as strong as it once was. Leben isn’t a great technical striker, but when he hits you, it does a lot of damage.

In what could be Tito Ortiz’ final bout with the UFC, he is a heavy underdog (+365) in his contest with wrestling standout Ryan Bader (-465).

Bader has just one loss in his career, to current champion Jon Jones. Ortiz hasn’t won a fight since beating Ken Shamrock in October of 2006. He hasn’t beaten anyone currently relevant since he beat Forrest Griffin in a close decision in April of 2006.

Check out all the current odds for UFC 132 after the jump.

UFC 132 Betting Odds

Saturday, July 2

Bantamweight Championship – Dominick Cruz (-130) vs. Urijah Faber (+100)

Middleweight Bout – Chris Leben (+155) vs. Wanderlei Silva (-185)

Welterweight Bout – Dong Hyun Kim (-120) vs. Carlos Condit (-110)

Light Heavyweight Bout – Tito Ortiz (+365) vs. Ryan Bader (-465)

Lightweight Bout – Shane Roller (+215) vs. Melvin Guillard (-275)

Lightweight Bout – Dennis Siver (-135) vs. Matt Wiman (+105)

That isn’t the case for my lightweight rankings.

Of any division in MMA, the lightweights are the toughest to sort through. The group is very top-heavy and even the distant contenders are hard to decipher.

Nonetheless, here is my top 10 list for the lightweights. Feel free to add your take on who should be in the top spots.

(If you need to go back and find my pound-for-pound, heavyweight, light heavyweight, middleweight, or welterweight rankings, click on the links)

1. Frankie Edgar (13-1-1) – Edgar is the UFC Lightweight Champion and the lone lightweight in the world to clearly dominate the great B.J. Penn. Edgar will get his chance to put his stamp on the top spot when he faces Gray Maynard for the third time on May 28, but the fact that Edgar pulled out a draw at UFC 125 after that brutal first round is a testament to his abilities. Edgar’s speed, hands, and wrestling are a very impressive combination, especially for a man that could arguably fight at featherweight.

2. Gray Maynard (10-0-1) – Maynard has yet to lose and if he didn’t put everything he had into knocking Edgar out in the first round of their UFC 125 bout, he would be the champion today. Maynard was once just a wrestler, but is now showing strong striking ability. If he can put forth a full 25 minutes in May, he will become the champion and take over the top spot in my rankings.

3. Gilbert Melendez (19-2) – Melendez deserves some real consideration for this top spot and in my opinion, he is the top fighter in all of Strikeforce. Melendez genuinely competes against some of the top fighters around the world that fans aren’t that familiar with. Still, Gilbert needs to prove it on the biggest stage of them all, the octagon, to get my top spot.

4. Jim Miller (20-2) – Miller has just two losses in his career, and that is to the pair on top of this list. Both losses came by decision, and since that time, Miller has gone on to win seven-straight fights. Miller has a great style and aggressive attitude and his will may be greater than his talent, which makes him a dangerous opponent.

5. Anthony Pettis (13-1) – I am a fan of Pettis, and it isn’t just because of his “Showtime Kick” on Ben Henderson. Pettis is a very dynamic striker, but his ground game keeps getting better. He submitted a ground specialist in Shane Roller and he out-wrestled Ben Henderson to become the final WEC Lightweight Champion. Given the success WEC fighters have had in the UFC thus far, I see no reason that Pettis won’t be a problem for anyone in the UFC.

6. Shinya Aoki (27-5, 1 NC) – Aoki is the Dream Lightweight Champion. He is one of the best submission fighters in the world. The man has 17 submission wins in his career and his skills are so diverse that many of his opponents don’t know how to handle him. Still, in his chance to really shine against Melendez in April of 2010, he put on a terrible performance that is hard for me to forget about. His recent win over Lyle Beerbohm helped erase that, but I need to see him beat a real notable opponent in the states to take him seriously as a top-5 contender.

7. Eddie Alvarez (22-2) – Alvarez is the Bellator Lightweight Champion and probably the best single fighter in the whole organization. His last lost came against Aoki in 2008, but he still holds wins over former UFC fighters like Roger Huerta and Josh Neer. Alvarez has quick hands and some strong grappling. Only time will tell if he will ever fight on the big stage of the UFC.

8. Clay Guida (28-11) – Guida doesn’t get a lot of respect as a top-ranked lightweight, but to me, Guida is right there. His losses have come against some of the best in the division. He was beaten by Diego Sanchez and Kenny Florian, both who contended for the title in the recent past. Guida has now won three straight and gets a crack at Pettis in June. He may be limited because of his size and stature, but he brings the fight and will never back down.

9. Melvin Guillard (27-8-2) – Since being submitted by every legit contender in the UFC, Guillard seems to have gotten his career on track. Now a winner of four straight, Guillard is emerging as a top contender in the division after his TKO of Evan Dunham last January. As long as Guillard can stay off his back, he can beat anyone. That will be the test for him when he takes on Roller at UFC 132 in July.

10. Dennis Siver (17-8) – Siver emerged with his decision win over George Sotiropoulos at UFC 127 and he has now won seven of his last eight. The compact kick boxer posses problems for wrestlers because of his strength and size and he also poses problems for strikers because of his devastating kicks and punches. Siver is on the fast track in the UFC right now, but he must keep up the momentum when he takes on Matt Wiman at UFC 132.