Daniel Jeffery Henderson, (born August 24, 1970) is an American mixed martial artist and former Olympic wrestler, who competes as a middleweight and light heavyweight in the Ultimate Fighting Championship. He is the former Strikeforce Light Heavyweight Champion and was the last Welterweight 183 lb (83 kg; 13.1 st) and Middleweight 205 lb (93 kg; 14.6 st) champion of Pride Fighting Championships. He was the only mixed martial artist to concurrently hold two titles in two different weight classes in a major MMA promotion. Henderson is also the UFC 17 Middleweight Tournament Winner, the 1997 Brazil Open Lightweight Tournament Champion, the RINGS King of Kings 1999 Tournament Winner, and the 2005 PRIDE Welterweight Grand Prix Champion.

Henderson also owns the Clinch Gear MMA apparel brand. As of May 2012, Henderson is ranked the #2 light heavyweight by Sherdog.

Dan Henderson was born in Downey, California and grew up in Apple Valley, California. He attended Victor Valley High School in Victorville, California, and earned medals at the California State Wrestling Championships in 1987 and 1988. He was a member of the 1987 Victor Valley High School wrestling team state champions. Henderson went on to wrestle at both Cal State Fullerton and Arizona State University, participating in the 1993 NCAA championships. He represented the United States in the 1992 and 1996 Summer Olympics in Greco-Roman wrestling.

Michael Gavin Joseph Bisping (born 28 February 1979) is an English mixed martial artist. He fights in the middleweight division of the Ultimate Fighting Championship and is the former Cage Warriors Fighting Championship Light Heavyweight Champion, former Cage Rage Light Heavyweight Champion and The Ultimate Fighter 3 Light Heavyweight Tournament winner. As of March 2012, Bisping is ranked the No. 4 middleweight in the world by Sherdog.

Bisping was born in manchester UK in 1979, but moved to Bridlington, East Yorkshire, England when he was a child. Taking an early interest in martial arts, Bisping began training in a traditional form of jiu-jitsu known as Yawara Ryu under Paul Lloyd Davies when he was 8 years old. In 1994, at the age of 15, Bisping competed as an amateur in England's first "no holds barred" competition, a precursor to modern MMA, called Knock Down Sport Budo (KSBO), organised by Davies.

At the age of 18, Bisping decided to abandon his martial arts training in order "to pursue real life". But less than a year later Bisping began training kickboxing and karate on the advice of Alan Clarking, owner of Black Knights gym, who saw potential in the young fighter. Bisping enjoyed a short, but successful kickboxing career, winning the North West Area title and later the Pro British light heavyweight kickboxing title. After again briefly quitting competition in 1998, Bisping returned to kickboxing to take the Pro British light heavyweight title for a second time. Soon after winning his second kickboxing title, Bisping was forced to abandon his full-time training for a "real job". Bisping worked in factories, slaughterhouses, as an upholsterer, a postman, a tiler, a plasterer, a double-glazing door salesman,production line operative making barbecues at Rectella in Clitheroe and also a relatively successful DJ around the north-west club scene.

Vítor Vieira Belfort (Portuguese pronunciation: [ˈvitoʁ viˈejɾɐ bɛwˈfɔʁ]; born April 1, 1977) is a Brazilian mixed martial artist and former UFC Light Heavyweight Champion. Belfort was born in Rio de Janeiro and studied jiu-jitsu with the Gracie family, namely Carlson Gracie. He received a black belt under Carlson and currently trains with Xtreme Couture, fighting in the middleweight division. He is currently ranked as the #3 middleweight in the world by MMA Weekly.

Vítor was born on April 1, 1977 in Rio de Janeiro, Brazil to a French father and a Greek mother. Belfort is married to Joana Prado and together they have three children, a son named Davi (born February 5, 2005), a daughter named Victoria (born October 31, 2007), and a daughter named Kyara (born June 7, 2009).

Belfort also had a small part in a reality show on Brazilian television and appeared next to his wife when she was photographed for the Brazilian edition of Playboy.

On January 9, 2004, Vítor's sister, Priscila Belfort disappeared and the relatives received no information about her. In August 2007, a woman (identified as Elaine Paiva) confessed that she participated in her kidnapping and killing and that she was kidnapped to pay off a four thousand dollar debt Paiva had with drug dealers. Paiva was arrested along with three others alleged to be involved in the kidnapping. The group allegedly buried her body in the woods in Rio de Janeiro where police conducted searches but her remains have never been found. Her family however do not accept this version and believe that Priscila is still alive somewhere. Vítor still maintains a missing sign in the Brazilian version of his website.

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.

Ricardo Arona (Portuguese pronunciation: [ʁiˈkaʁdu aˈʁõnɐ]; born July 17, 1978 in Niterói) is a Brazilian mixed martial artist and PRIDE FC Middleweight Grand Prix finalist. He has competed in PRIDE Fighting Championships and RINGS in his mixed martial arts career, and is a member of Brazilian Top Team.

Ricardo Arona's popularity came from competing in the Olimpo's Combat Club submission wrestling competitions, where he won an open weight tournament as well as the 92 kg (202 pound) tournament. Arona is the only competitor in Abu Dhabi to have won a championship and to be undefeated so far. ADCC Submission Wrestling World Championship.

Soon after Abu Dhabi Combat Club, Arona joined RINGS, a Japanese mixed martial arts promotion. Arona's only loss in RINGS came at the hands of Fedor Emelianenko, in a controversial decision on the scoring system of the RINGS organisation. Some people thought and believed had it been scored on different value terms, that Arona would've clearly won the fight. However again, as RINGS scoring was not based on positional control but rather on damage dealt and attempts to finish the fight, categories in which many thought Fedor surpassed Arona in, the decision was given to Emelianenko, thus supporting the judges' decision. Fedor later went on to become Pride Fighting Championships' Heavyweight Champion. After losing to Fedor, Arona won his last three fights in RINGS.