Assuerio Silva (born June 18, 1974) is a Brazilian mixed martial artist and professional boxer, having most recently competed in the Ultimate Fighting Championship and Pancrase. He became the Heavyweight King of Pancrase on May 30, 2007, defeating Tatsuya Mizuno.

Silva holds a professional fight record of 13–6–0¹, the majority of his wins coming via submission. He fought three times in Pride FC in 2001, winning twice. However, after signing a three-fight contract with UFC, he was less successful, losing all his fights to Tim Sylvia, Brandon Vera and Cheick Kongo.

His height is 6 ft 1 in and he weighs 241 pounds. In addition to training Muay Thai, he holds a black belt in karate. Silva is also a Black Belt in Jiu Jitsu. He fights out of Curitiba, Brazil with Total Punch Mixed Martial Arts Academy.

Silva bounced back from his latest loss to Cheick Kongo by becoming the King of Pancrase after a 2nd round TKO win over Tatsuya Mizuno. He won this vacated title at Pancrase Rising 6 last 30 May 2007. He was scheduled to defend the championship against the former champion, Kestutis "Tiger" Arbocius, on 14 October 2007 at the Differ Ariake Arena in Tokyo, Japan, but Arbocius no-showed at the event. Shortly thereafter, Silva vacated the Championship to pursue a contract with the newly formed Hardcore Fighting Championships in Canada.^{[citation needed]} However, the organization folded before he was able to fight once under their banner.

Valentijn Overeem (born 17 August 1976) is a Dutch professional mixed martial artist and former kickboxer who competes as a heavyweight. He has previously fought for the PRIDE Fighting Championships, RINGS and Strikeforce. He holds notable wins over UFC hall-of-famer Randy Couture, K-1 Stand out Ray Sefo, English MMA Veteran Ian 'The Machine' Freeman, former Pancrase Heavyweight Champion: Kazuo Takahashi, former 2 time RINGS Openweight Champion: Kiyoshi Tamura, and Brazilian 'Babalu' Sobral.

Overeem was born in Amersfoort, but now lives in Belgium and is currently associated with the Imperial Athletics gym where he trains with his younger brother Alistair. He holds notable wins over Renato Sobral,and Ray Sefo all by submission.

On 9 June 2010, Valentijn signed to fight under the Strikeforce banner. He was scheduled to fight Antonio Silva on 4 December 2010, but suffered an injury that caused him to withdraw from the fight. He eventually made his promotional debut against Ray Sefo at Strikeforce: Fedor vs. Silva on 12 February 2011 where he won in the first round by using a neck crank.

Todd Duffee (born December 6, 1985) is an American mixed martial artist who competes in the heavyweight division. He is currently signed with India's Super Fight League. Duffee fought for the Ultimate Fighting Championship until his surprise release in September 2010, which came as a result of an apparent dispute with UFC President Dana White. He trains with the American Kickboxing Academy.

Duffee was born in Evansville, Indiana and grew up in Raleigh, Illinois as the 3rd son of a coal miner father and nurse mother. He was working on a degree from the University of Georgia before leaving to train MMA full time.

Duffee got his start into MMA after enrolling in boxing, at the age of sixteen. After moving down to Atlanta, Georgia; Duffee was able to take classes at a boxing gym. After learning more about MMA, he immediately went out and rented old UFC fights and three days later, Duffee was training at a local MMA gym.

Duffee won his first three fights against Mike Walbright, Mark Haniger and Josh Bennett. Duffee then agreed to fight UFC and PRIDE FC veteran, Assuerio Silva in the main event of Jungle Fights 11. Duffee dominated the fight and won by knockout in the second round.