BetUS.com's Pound-for-Pound Rankings

1. Anderson Silva (26-4)

Silva is a Brazilian mixed martial arts (MMA) fighter. He is the current UFC Middleweight Champion. Drawing criticism for his below par performances against Thales Leites and Demian Maia, Silva was clearly in need of an interesting challenge. Silva has taken out elite welterweights, middleweights and the light heavyweight fighter Forrest Griffin. Next up, he is to fight trash-talker Chael Sonnen at UFC 117.

2. Georges St. Pierre (20-2)

St. Pierre often referred to as GSP, is a Canadian professional mixed martial artist. He is currently the Welterweight Champion of the UFC, and is ranked as one of the top "pound-for-pound" fighters by multiple MMA sources. Despite debate over the improper use of Vaseline by St. Pierre's cornermen, GSP tore through B.J. Penn in their Jan. 31 superfight at UFC 94. He also beat Thiago Alves by Unanimous Decision at UFC 100 in the co-main event. Now after dominating Dan Hardy in his last fight he has been positioned for a rematch with the ever improving Josh Koscheck.

3. Mauricio Rua (19-4)

Rua is a mixed martial arts (MMA) fighter and current Light Heavyweight Champion in the Ultimate Fighting Championship (UFC). The consensus 2005 "Fighter of the Year" had a chance to regain light heavyweight supremacy at UFC 104 in October against none other than the unbeatable "Dragon," Lyoto Machida. Even though Rua lost by decision UFC president Dana White, commentators Joe Rogan and Mike Goldberg, fans and fighters gave the fight to "Shogun." In the rematch, he proved them right by whipping the Dragon via KO in less than 4 minutes into the fight.

4. Jose Aldo (17-1)

Jose Aldo da Silva Oliveira Junior is a Brazilian mixed martial arts fighter. He is the current WEC Featherweight Champion. Aldo is currently ranked the #1 featherweight in the world after beating Urijah Faber, who was a top pound-for-pound fighter on most lists. Although he has a black belt in Brazilian Jiu-jitsu a lot of his victories has ended in KO or TKO.

5. Brock Lesnar (5-1)

Brock Lesnar is your heavyweight UFC Champion and after a year off due to a life-threatening illness, the Next Big Thing is the big thing in the UFC. In his latest battle against interim champ Shane Carwin, Lesnar withstood a first-round barrage of fists and after Carwin punched himself out, Lesnar took it to the mats in the second and won easily. Next up is a battle against Cain Velasquez and while Carwin proved that Lesnar isn't invincible, Lesnar is still the big dog in the big division of the UFC.

6. Frankie Edgar (12-1)

Edgar is a mixed martial arts (MMA) fighter who is the current Ultimate Fighting Championship Lightweight Champ. Not wanting to hear any more discussion about him cutting to 145 pounds, Edgar made a strong statement that he can hang against elite lightweights, staying a step ahead of former UFC lightweight champ Sean Sherk for the full 15 minutes of their May 23 bout. He proved himself again by taking out Matt Veach and shockingly dethroning B.J. Penn. He'll have to prove he deserves his spot as Penn will be gunning for him in a rematch later this year.

7. Fedor Emelianenko (32-2, 1 NC)

Emilianenko is a Russian heavyweight mixed martial arts fighter. He was considered to be the pound-for-pound best by many until Fabricio Werdum turned the rankings upside down with a win in a recent Strikeforce bout. It was his first ever non-controversial loss in MMA and it has dropped him down the standings across the board. He'll have a rematch with Werdum in attempt to prove that it was just a fluke but some are wondering whether he's simply passed his prime. Considering his track record, Emelianenko deserves the benefit of the doubt.

8. B.J. Penn (15-6-1)

Penn is an American professional mixed martial arts fighter and Brazilian Jiu-Jitsu practitioner and former Ultimate Fighting Championship (UFC) Lightweight Champion. Like Emelianenko, Penn has falled in the pound-for-pound rankings after a surprising loss on April 12, 2010. Frankie Edgar was supposed to be just another challenger that Penn disposed of but the world was surprised when it was Edgar that looked a tad crisper and a step faster. A re-match is set at UFC 118 in Boston and Penn will be fired up to prove that he still owns the Lightweight division.

9. Jake Shields (25-4-1)

Jake Shields is an American mixed martial artist. He is the first & last Elite XC Welterweight Champion. He is also the former Shooto World Champion, and was the Strikeforce Middleweight Champion. Jake earned the Strikeforce title by going the distance and prevailing over Jason "Mayhem" Miller. Jake got his 14th win in a row courtesy of the MMA vetern Dan Henderson.

10. Lyoto Machida (16-1)

Machida is a Japanese-Brazilian mixed martial arts (MMA) fighter who fights as a light heavyweight in the Ultimate Fighting Championship (UFC) and is the former UFC Light Heavyweight Champion. Fresh off his May 23 blowout of Rashad Evans, it was thought Machida would soon start preparing for a challenge from former light heavyweight top dog Quinton Jackson. However, with Jackson opting for a second coaching stint on "The Ultimate Fighter," Machida's first title defense was on October 24th against Mauricio "Shogun" Rua at UFC 104. Although Machida won by unanimous decision, there was a lot of controversy surrounding the fight as it was too close to call. Machida lost at the UFC 113 reamatch in a devastating manner.