The Ultimate Fighting Championship began its events in 2012 with UFC 142 on January 14. The year saw the successful UFC Featherweight title defense by José Aldo at UFC 142, the crowning of Carlos Condit at UFC 143 as the Interim Welterweight Champion, a new Lightweight Champion in Ben Henderson at UFC 144, a tournament to crown the first UFC Flyweight Champion at UFC on FX: Alves vs. Kampmann as well as the finales of The Ultimate Fighter 15 and The Ultimate Fighter: Brazil.

UFC 142: Aldo vs Mendes was held on January 14, 2012 in Rio de Janeiro, Brazil.

The event featured José Aldo defending his UFC Featherweight Championship against Chad Mendes. Aldo became WEC Featherweight Champion on November 18, 2009, which was later converted to a UFC Championship, and has defended his title four previous times with stoppages. Five of the last six fights, all wins, for Mendes resulted in unanimous decisions. Aldo defeated Mendes by knock out in 4:59 of the first round with a knee.

The co-main event was a bout between Vitor Belfort and Anthony Johnson. The day prior, during weigh-ins, Johnson failed to make the 185 pounds (84 kg) weight limit for the match and was 11 pounds (5.0 kg) over weight. Belfort agreed to fight Johnson in a catch weight bout of 197 pounds (89 kg) if Johnson did not weigh more than 205 pounds (93 kg) on fight day. Belfort was able to submit Johnson with a rear-naked choke in 4:49 of the first round. Johnson was cut by the UFC following the fight.

The Ultimate Fighting Championship (UFC) is the largest Mixed Martial Arts promotion company in the world, which hosts most of the top-ranked fighters in the sport and produces events worldwide. Based in the United States, the UFC has eight weight divisions and enforces the Unified Rules of Mixed Martial Arts.Dana White serves as the president of the UFC while Frank and Lorenzo Fertitta control the UFC's parent company, Zuffa, LLC.

The first UFC event was held in 1993 in Denver, Colorado. The purpose of the event was to identify the most effective martial art in a real fight between competitors of different fighting disciplines, including Boxing, Brazilian Jiu-Jitsu, Tae Kwon Do, Wrestling, Muay Thai, Karate and other styles. In subsequent competitions, fighters ventured outside their base style to utilize effective techniques from other disciplines, which indirectly helped create an entirely separate style of fighting known as present-day mixed martial arts.

With a cable-television deal and expansion into Canada, Europe, Australia the Middle East,Asia and new markets within the United States, the UFC as of 2011^[update] has gained in popularity, along with greater mainstream-media coverage. As of 2001^[update] viewers can access UFC programming on pay-per-view television in the U.S., Brazil, Australia, Canada, New Zealand and Italy. UFC programming can also be found on FX, Fuel TV, and Fox in the U.S., on ESPN in the United Kingdom and Ireland, as well as in 150 countries and 22 different languages worldwide. UFC also carries a mobile site for on-the-go users and a Sports Bars page for fans to find places showing the pay-per-view. It is also available on the Roku streaming player.

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.

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.

Renzo Gracie (English pronunciation: /ˈhɛnzoʊ ˈɡræsiː/; born March 11, 1967) is a Gracie Barra Brazilian Jiu-Jitsu black belt under Carlos Gracie Jr. and a retired mixed martial arts fighter. He is member of the Gracie family of Brazil. He is the son of Robson Gracie, grandson of Carlos Gracie, nephew of Carlos Gracie, Jr. and grandnephew of Helio Gracie.

A world famous Jiu-Jitsu coach, Gracie has helped train a number of professional fighters such as: Matt Serra, Ricardo Almeida, Georges St. Pierre, Frank Edgar, Rolles Gracie, Chris Weidman, Kyra Gracie and Roy Nelson. His brothers Ralph Gracie and the late Ryan Gracie were also famous fighters.

Gracie has competed both in Brazilian Jiu-Jitsu and mixed martial arts events such as the PRIDE Fighting Championships, the International Fight League, RINGS, Martial Arts Reality Superfighting (MARS) and the World Combat Championship.

On February 10, 2007 Gracie won a match against former UFC light heavyweight champion Frank Shamrock for upstart MMA promotion EliteXC on its debut night Saturday February 10, 2007, on Showtime. Gracie was able to take Frank down fairly easily after being overmatched on his feet and was still able to dominate on the ground for most of the match before Shamrock was disqualified by referee Herb Dean due to landing numerous illegal knee strikes to the back of Gracie's head while both fighters were on the ground. Shamrock had already been given one warning earlier in the match for illegal strikes to the back of Gracie's head. After the match, Gracie had to be helped out of the ring and back to his dressing room by his team allegedly due to receiving a concussion from the strikes.
Renzo formerly coached a team, the New York Pitbulls, for the International Fight League.