Nathan Donald Diaz (born April 16, 1985) is an American mixed martial artist of Mexican descent, currently competing for the UFC in the welterweight and lightweight divisions. He is the Ultimate Fighter Season 5 champion and has amassed victories in Strikeforce and World Extreme Cagefighting.

Diaz is a graduate of Tokay High School in Lodi, California and holds a black belt in Cesar Gracie Jiu-Jitsu. He is the younger brother of former Strikeforce Welterweight Champion Nick Diaz. Diaz is affiliated with the Cesar Gracie Jiu-Jitsu Academy in Lodi, California, where he trains under Brazilian Jiu-Jitsu black belt Cesar Gracie. Diaz received his black belt in Brazilian Jiu-Jitsu on April 6, 2012 from Cesar Gracie. He is currently ranked #7 lightweight fighter in the world.

He was a contestant on The Ultimate Fighter 5 show, of course exclusively featuring lightweights. He fought on Jens Pulver's team. In the preliminary round, Diaz defeated Rob Emerson by submission; in the quarterfinals he defeated fellow Team Pulver teammate Corey Hill via triangle choke in the first round. In the semifinals, he defeated Team Penn member Gray Maynard by submission, advancing to the finals where he faced Manvel Gamburyan.

Kurt Joseph Pellegrino (born May 7, 1979) is a former American mixed martial artist. He is best known for competing in the lightweight division of the UFC. Pellegrino's first fight in the UFC came in 2006. Pellegrino runs his own MMA Academy in Belmar NJ in which he has many up and coming fighters including Jeff Lentz, Steven Deangelis, Lester Caslow and fellow former UFC fighter Greg Soto. He lives and trains in New Jersey and also trains with Kenny Florian's camp in Boston, Massachusetts. Pellegrino trained previously at the Armory in Jupiter, Florida with Justin Haskins, Eduardo Guedes, and Raphael Chaves. Prior to the Armory, he trained with Ricardo Almeida, a world famous Brazilian Jiu Jitsu competitor at a Renzo Gracie affiliate school. He wrestled for Point Pleasant Boro High School and placed second in the state in his junior and senior year. Pellegrino was a two-time wrestling state finalist. Opened Kurt Pellegrino's MMA School in Belmar, New Jersey in 2008. 'Batman' holds notable wins over Mac Danzig, Josh Neer and a submission win over Jiu-Jitsu ace Fabricio Camoes.

Marcus Paul Davis (born August 24, 1973), is an Irish-American mixed martial artist. He currently fights as a welterweight. He was a contestant on The Ultimate Fighter 2 on Spike TV.

Davis was born in Houlton, Maine. His family comes from Waterford, Ireland.

Marcus began boxing at 14. At the age of 19 Davis began his career with a second round TKO of Luis Guzman in April 1993. He compiled a professional record of 17–1–2 over the next seven years on the New England circuit, where he fought primarily as a junior-middleweight. In his last fight as a boxer, he suffered a TKO loss to 34 year old Ed Bryant which led him to reconsider his future as a successful boxer. He then became excited with the challenge of mixed martial arts, much to the bemusement of his peers. He retired from boxing after the TKO loss in October 2000.

Prior to boxing, Marcus did martial arts from the age of eight. In 1995, Davis, then based in Massachusetts, started grappling training with Joe Maffei. In 1997, he moved back to Bangor and opened up an MMA school, while running a bar. The doormen took classes at the school, one of whom was Tim Sylvia. After Tim joined Miletich Fighting Systems in 2000, Marcus quickly followed. More recently, he has trained with Mark Dellagrotte and his own team in Bangor, Team Sityodtong. He also frequently visits Jorge Gurgel's main MMA academy in West Chester, Ohio.^{[citation needed]}

Anthony Pettis (born January 27, 1987) is an American mixed martial artist who competes in the lightweight division and is currently signed with the Ultimate Fighting Championship. A professional MMA competitor since 2007, Pettis has made a name for himself mainly fighting in his home state of Wisconsin. He is a former fighter for the World Extreme Cagefighting (WEC), where he was the last WEC Lightweight Champion before merging the promotion into the UFC.

Born to Eugene Pettis Jr. and Annette Garcia, Anthony Pettis grew up in the south side of Milwaukee, Wisconsin along with his older brother Ray Pettis and younger brother Sergio "Lil' Showtime" Pettis. Pettis is of Mexican and Puerto Rican ancestry, his grandfather Anglicized the family name from Perez to Pettis, to avoid discrimination. Pettis attended Dominican High School.

Anthony "Showtime" Pettis made his professional MMA debut in December 2007. He compiled an undefeated record of 8-0 in shows all based in Milwaukee, Wisconsin before debuting with the WEC. Pettis also has a professional kickboxing background.

Jake Shields (born January 9, 1979) is an American mixed martial artist who is currently fighting in the middleweight division of the UFC. He is the last Rumble on the Rock 175 lb (79 kg) champion. He is the first and last Elite XC Welterweight Champion. He is also the former Shooto Welterweight Champion and is the former Strikeforce Middleweight Champion. Shields is currently ranked as the #8 welterweight fighter in the world by MMAWeekly.

He has trained extensively with Cesar Gracie, and is a member of the "Elite Pack" which includes fellow Cesar Gracie students Dave Terrell, Nick Diaz, Nate Diaz and Gilbert Melendez. After his loss to Akira Kikuchi he won 15 consecutive fights over 6 years, until his loss to Georges St-Pierre. Among his victories are wins over Martin Kampmann, Dan Henderson, Paul Daley, Hayato Sakurai, Jason 'Mayhem' Miller, Carlos Condit, Yushin Okami, and Yoshihiro Akiyama. He describes his style as American Jiu jitsu.

Shields was raised near Mountain Ranch California in the Sierra Nevada Mountains. He was home schooled up to junior high. He and his two older brothers grew up at the end of a dirt road on the rim of the Jesus Maria Canyon. Their nearest friends were a 45 minute hike down one side of the canyon and up the other. Their activities included mountain biking, wild caving, snowboarding, clearing brush, bucking firewood, climbing mountains, exploring the high country, and wrestling.