UFC 104: Machida vs. Shogun was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on October 24, 2009 in Los Angeles, California.

As with UFC 103, the UFC announced a portion of the preliminary card would air live and commercial-free during an hour-long block on Spike.

Chase Gormley, who was slated to face Ben Rothwell, instead faced Stefan Struve after Rothwell's opponent was changed to Cain Velasquez. An injured Sean Sherk was replaced by Josh Neer against Gleison Tibau.

Additionally, on the day of the weigh-in, two fights were changed to catchweight status as Anthony Johnson, Josh Neer and Gleison Tibau all came in over the weight limit of their respective weight classes.

Fighters were awarded $60,000 bonuses.

The following is the reported payout to the fighters as reported to the California State Athletic Commission. It does not include sponsor money or "locker room" bonuses often given by the UFC.

^ Anthony Johnson was reportedly fined 20 percent of his purse for failing to make the 170-pound welterweight limit. The CSAC's initial report did not include information on the penalty.

Lyoto Carvalho Machida (Portuguese pronunciation: [liˈotu maˈʃidɐ]; born May 30, 1978) is a Japanese-Brazilian mixed martial artist from Salvador, Bahia, Brazil who fights as a light heavyweight in the Ultimate Fighting Championship. He is a former UFC Light Heavyweight Champion and is currently ranked as the #6 light heavyweight fighter in the world by Sherdog, MMAWeekly and Yahoo! Sports.

Machida was born in the city of Salvador as the third son of the highly ranked head of the Brazilian branch of the Japan Karate Association, Shotokan karate master Yoshizo Machida. Yoshizo moved to Brazil from Japan when he was 22 years old. There he met and married Lyoto's mother, Ana Claudia. Growing up in Belém, Lyoto began training in karate at the age of three and earned his black belt at the age of thirteen. He also began training in sumo at twelve and Brazilian Jiu-Jitsu at fifteen. He won a number of amateur karate tournaments, including the 2001 Pan American Karate tournament.

He was the runner-up in the 2000 Brazilian Sumo Championships in the 115 kg division. As an adult, he became Brazilian Champion twice under Taylor Swanson, and placed second in the South American Championship. He defeated American black belt Jiu-Jitsu fighter Rafael Lovato Jr. at L.A. Sub X. In addition to his sumo and karate achievements, he has a college degree in Physical Education. Lyoto's brother, Chinzô, is a Shotokan vice-champion (Australia 2006), losing only to number-one ranked Shotokan master Koji Ogata. Lyoto and Chinzô fought in a Karate Final 10 years ago in which Lyoto gave Chinzô a cheek scar that still exists today. His other brothers include Kenzo Machida, a TV journalist for one of Brazil's biggest TV stations, Take Machida and adopted brother Francisco Machida.

Dana White (born July 28, 1969) is the current President of the Ultimate Fighting Championship (UFC), a mixed martial arts organization based in the United States.

Born in Manchester, Connecticut on July 28, 1969, White grew up in Las Vegas, Nevada, Ware, Massachusetts and Levant, Maine. White is a passionate Boston Red Sox fan. During his youth, he bounced back and forth between Boston and Maine. He attended the University of Massachusetts Boston but did not finish; however, while there he did launch a boxing program for inner-city youth.

White has a background as an aerobics instructor. In 1992, White established Dana White Enterprises in Las Vegas. He conducted aerobics classes at three gyms in the Las Vegas area and began managing MMA fighters Tito Ortiz and Chuck Liddell.

While working as a manager, White learned that Semaphore Entertainment Group, the parent company of the UFC, was looking for a buyer for the UFC. White contacted childhood friend Lorenzo Fertitta, an executive at Station Casinos, and a former commissioner of the Nevada State Athletic Commission. Within a month, Lorenzo and his older brother Frank bought the UFC, with White installed as its president. White currently owns about 9% of Zuffa, LLC, the entity the Fertitta brothers created to own and manage the UFC.

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.

Cain Velasquez Ramirez (born July 28, 1982) is a Mexican American mixed martial artist fighting in the Ultimate Fighting Championship where he is a former UFC Heavyweight Champion. He is a two-time All-American collegiate wrestler from Arizona State University in Tempe, Arizona, and a Junior College National Champ at Iowa Central Community College. He is a two-time 5A state champion in Arizona, compiling a record of 110–10 for Kofa High School in Yuma, Arizona. Cain Velasquez is ranked #2 in the heavyweight division.

Velasquez, a Mexican American, was born on July 28, 1982 in Salinas, California to Efrain and Isabel Velasquez. Velasquez's father, Efrain, came from Mexico to the United States illegally. Efrain met his wife Isabel, married her, and gained US citizenship. Velasquez has two siblings, Efrain, Jr., and Adela. He was raised in Yuma, Arizona. He graduated from Kofa High School, where he compiled a record of 110–10 in four years of wrestling, including winning the 5A Arizona Wrestling Championship twice. Velasquez also played football for three years. As a senior, he served as Captain of both his wrestling and football teams.