Jeremy Graham Horn (born August 25, 1975) is an American mixed martial artist. He is one of the most experienced fighters in the sport with a professional record of 89–21–5. He has displayed an iron chin throughout his career having never been knocked out or knocked down until his 95th fight, against Chuck Liddell.

Horn's early martial arts training was under Robert Bussey's Warrior International founder, Robert Bussey. Horn earned a RBWI black belt under Bussey in 1992, and spent most of his career with the Miletich Fighting Systems team in Iowa, and is currently training in Salt Lake City, Utah with Elite Performance, the team that he created.

Horn's notable victories include Gilbert Yvel, Forrest Griffin, Dean Lister, David Loiseau, Travis Fulton, Chael Sonnen (x3) and Chuck Liddell. He also fought to a draw against UFC Hall Of Famer Dan Severn at Extreme Challenge 7 in 1997.

Horn defeated the eventual light heavyweight champion and UFC star Chuck Liddell via arm-triangle choke at UFC 19. Liddell later avenged his loss to Horn at UFC 54 in the fourth round, when the fight was stopped after Horn told the referee he could no longer see.

Chael Patrick Sonnen (pronounced /ˈtʃeɪl ˈsʌnən/; born April 3, 1977) is an American mixed martial artist who competes as a middleweight in the Ultimate Fighting Championship. He was an NCAA Division I All-American wrestler at the University of Oregon, a silver medalist at the 2000 Greco-Roman World University Championships, as well as a two-time Dave Schultz Memorial International Greco-Roman winner.

As of October 2011^[update], Sonnen is ranked as the No. 2 middleweight in the world by Sherdog.

Sonnen was born Chael Patrick Sonnen on April 3, 1977 in West Linn, Oregon.

Sonnen started his MMA career at the age of 19 in 1997 by defeating Ben Hailey in Vancouver, Washington. His second fight was against future ICON Sport Middleweight Champion and Strikeforce Middleweight contender Jason "Mayhem" Miller. Sonnen went 6–0 in his first six fights, until his loss to Trevor Prangley, which he later avenged in 2006 at UFC Ultimate Fight Night 4. He also fought The Ultimate Fighter winner and former UFC Light Heavyweight Champion Forrest Griffin.

Forrest Griffin (born July 1, 1979) is an American mixed martial artist. Since 2005, he has been signed to the Ultimate Fighting Championship where he is a former UFC light heavyweight champion.

Griffin, a former Georgia police officer, first rose to prominence after winning the first season of The Ultimate Fighter. In the tournament finals, he fought and defeated Stephan Bonnar in an exciting brawl that is widely credited as sparking the current success of the UFC. He went on to serve as a coach on the 7th season of the reality series opposite Quinton Jackson, whom he later defeated at UFC 86 to become the Undisputed UFC Light Heavyweight Champion. He and Rashad Evans are the only fighters to go from winning The Ultimate Fighter to winning the UFC Light Heavyweight Championship.

Griffin graduated from Evans High School in Evans, Georgia, a suburb of Augusta. He then graduated with an A.B. in Political Science from the University of Georgia. While attending school, Griffin served as a law enforcement officer for the Richmond County Sheriff's Office in Augusta, Georgia. He also served as a patrol officer with the University of Georgia Police.

Thales Leites Lourenço (Portuguese pronunciation: [ˈtaliʒ ˈlejtʃiʃ]; born September 6, 1981) is a Brazilian mixed martial artist. He is the current Superior Challenge middleweight champion.

A relative newcomer to the sport, Leites made his mixed martial arts debut at Shooto Brazil in 2003, defeating Felipe Arinelli by arm-triangle choke submission. Leites would win his next two fights in Vitória before making his debut in the United States in Hawaii's Rumble on the Rock promotion in 2005, where he defeated Adam Roland in his fourth consecutive mixed martial arts victory.

After a successful outing in the U.S., Leites returned to Brazil to fight Gustavo Machado, who was coming off two wins in the Japanese Pancrase organization. Leites defeated the more experienced Machado by submission in the third round, and was invited back to Rumble on the Rock to fight Hawaiian Ronald Jhun in September. Despite fighting a hometown favorite, Leites notched his sixth victory, defeating Jhun by technical knockout in the later half of the fight.

Anderson da Silva (Portuguese pronunciation: [ˈɐ̃deʁsõ ˈsiwvɐ]; born April 14, 1975) is a Brazilian mixed martial artist. He is the current UFC Middleweight Champion and the promotion's longest reigning champion. With 14 consecutive wins and 9 title defenses, Silva holds the longest winning streak and title defense streak in UFC history.

Silva is ranked as the number one Middleweight in the world by multiple publications, and is the consensus No. 1 pound-for-pound fighter in the world according to ESPN, Sherdog, Yahoo! Sports, MMAFighting.com and other publications. UFC president Dana White has proclaimed Silva as "the greatest mixed martial artist ever."^{[undue weight? – discuss]} Silva is also the last Cage Rage Middleweight Champion and a former Shooto Middleweight Champion. Besides the UFC and Cage Rage, Silva has fought for a number of other MMA promotions including the Pride Fighting Championships, Shooto and Rumble on the Rock.

Although known primarily for his mastery of Muay Thai striking, Silva is also a Brazilian Jiu-Jitsu blackbelt, a rank he earned in 2006 from Antônio Rodrigo Nogueira who follows Gracie Lineage through Carlson Gracie, like Murilo Bustamante and the Brazilian Top Team. He began martial arts training at the age of 14, training Tae kwon do and earning a black belt by the age of 18. He is also a black belt in Judo and a yellow rope in Capoeira.