UFC 4: Revenge of the Warriors was a mixed martial arts (MMA) event held by the Ultimate Fighting Championship (UFC) on December 16, 1994, at the Expo Center Pavilion in Tulsa, Oklahoma. The event was seen live on pay-per-view, and later released on home video.

UFC 4 used an eight-man tournament format, with the winner receiving $64,000. The event also featured three alternate fights. All seven tournament fights were shown on the live pay-per-view broadcast, as well as the Jason Fairn vs. Guy Mezger alternate fight.

The tournament had no weight classes or weight limits. Each match had no time limit or rounds, therefore no judges were used for the night. The referee for the night was "Big" John McCarthy. Royce Gracie won the event by defeating Dan Severn with a triangle choke. The card also featured the notorious fight between Keith Hackney and Joe Son; Hackney won via submission after landing a series of unanswered strikes to the groin of Joe Son.

Play-by-play announcer Bruce Beck and color commentator Jeff Blatnick were paired together for the first time on the pay-per-view and became the regular commentary team on UFC broadcasts up to and including UFC 15. They were joined by regular contributor Jim Brown.

Royce Gracie (Portuguese: [ˈʁɔjsi ˈɡɾejsi], English: /ˈrɔɪs ˈgreɪsiː/; born December 12, 1966) is a Brazilian professional mixed martial artist, a UFC Hall of Famer and Brazilian Jiu-Jitsu practitioner. A legend and pioneer in the sport of mixed martial arts, he is widely considered to be the most influential figure in the history of modern MMA.

Gracie gained fame for his domination in the Ultimate Fighting Championship. He became known for beating opponents much larger than he was, and between 1993 and 1994, he was the tournament winner of UFC 1, UFC 2, UFC 4, and fought to a draw with Ken Shamrock in the championship match in the Superfight at UFC 5. Gracie popularized Brazilian Jiu-Jitsu and revolutionized mixed martial arts with his results contributing to the movement towards grappling and cross-training in the sport.

He holds the most submission victories in UFC history with 11, which he earned between UFC 1 and UFC 4.

Royce is a member of the Gracie family. He is the son of Hélio Gracie (Helio along with his older brother Carlos Gracie are the originators of Gracie Jiu-Jitsu—Modern Brazilian Jiu Jitsu) and spent his childhood in Rio de Janeiro, Brazil. As a toddler, Gracie learned Jiu-Jitsu from his father and his older brothers Rorion, Relson, and Rickson Gracie. He began competing at the age of 8 and by the time he was 16 had attained the level of blue belt.

Ron van Clief (born January 25, 1943 in Brooklyn, New York) is an American martial artist and an actor in Hollywood and Hong Kong action films. He is the father of poet Shihan van Clief.

Van Clief was born and raised in Brooklyn, New York City. In 1959, he joined the United States Marine Corps and served during the Vietnam War, before being discharged in 1965.

Ron van Clief began his martial arts career competing in both full-contact and non-contact karate tournaments in New York then internationally, going on to win several national tournaments and world championships.^[which?] He was nicknamed "The Black Dragon" for his competition victories.^{[citation needed]}

Van Clief was a student of Goju-ryu masters Peter Urban, Frank Ruiz, and Moses Powell, as well as WingTsun founder Leung Ting Modern Arnis (Remy Presas) Brazilian Jiujitsu (Joe Moreira).^{[citation needed]} In 1971, Van Clief created his own style of martial arts, called "Chinese Goju," attempting to unify Japanese style goju-ryu with its roots in Chinese martial arts.^{[citation needed]} He currently holds the rank of 10th degree red belt (shidoshi or grandmaster), in this system.^{[citation needed]}

Joseph E. Lauzon Jr. (born May 22, 1984) is an American mixed martial artist from Brockton, Massachusetts. He currently lives in Massachusetts and is training at Lauzon MMA in Bridgewater, Massachusetts.

Lauzon grew up in Brockton, Massachusetts until the third grade, when he moved to East Bridgewater, Massachusetts. Lauzon lived on a small farm.

Lauzon graduated from Wentworth Institute of Technology in 2006 with a Bachelor's degree in computer science. He worked as a network administrator in Cambridge, MA before he began training in mixed martial arts full-time.

Joe's younger brother, Dan Lauzon, is also a mixed martial artist.

Lauzon did not start his training martial arts until his junior year of high school. Beginning with learning grappling techniques, his first amateur fight was in 2002.

In 2004, Lauzon had his first professional fight. Winning with a first round armbar in a local Massachusetts promotion, Mass Destruction. Lauzon then went on an eight fight winning streak with all of the fights ended via submission. Lauzon won an eight-man tournament, defeating three fighters in one night in the World Fighting League and was crowned the WFL Grand Prix Champion. Lauzon was also named 2004 Massachusetts fighter of the year by local Massachusetts MMA outlets.

Brock Edward Lesnar (/ˈlɛznər/; born July 12, 1977) is an American professional wrestler, actor, former mixed martial artist and amateur wrestler, signed with WWE and appearing on its Raw brand. He is also a former UFC Heavyweight Champion and former #1 ranked mixed martial arts (MMA) Heavyweight by Sherdog; he was ranked #5 before he announced his retirement at the end of 2011. Lesnar is an accomplished amateur wrestler, winning the 2000 NCAA heavyweight wrestling championship and placing second in 1999, losing in the finals to 1999 world freestyle wrestling champion and future New England Patriots offensive lineman Stephen Neal.

He gained prominence in World Wrestling Entertainment (WWE) from 2002 to 2004, where he is a former three-time WWE Champion, becoming the youngest WWE Champion at age 25 with his first reign. Lesnar was the 2002 King of the Ring and the winner of the 2003 Royal Rumble. After leaving WWE, Lesnar pursued a career in the NFL. He played during the preseason for the Minnesota Vikings, but ended up being a late cut. Lesnar returned to professional wrestling at the end of 2005, and joined New Japan Pro Wrestling (NJPW), where he won the IWGP Heavyweight Championship in his first match. He was officially stripped of the title by NJPW in July 2006, and took the physical belt with him to Inoki Genome Federation (IGF), where he was still recognized as IWGP Champion until June 2007.