UFC 134: Silva vs. Okami 2 was a mixed martial arts event held by the Ultimate Fighting Championship on August 27, 2011 at the HSBC Arena in Rio de Janeiro, Brazil. The event was the second that the UFC has hosted in Brazil, since 1998's UFC 17.5: Ultimate Brazil. UFC 134 was awarded the 2011 event of the year by Sherdog.

UFC 1, 2, and 4 Tournament winner Royce Gracie was briefly linked to the event, but the rumors were refuted by UFC president Dana White.

Maiquel Falcão was scheduled to take on Tom Lawlor at this event, but was released from the promotion in regard to a 2002 assault charge. Lawlor was instead moved to UFC 139 to take on Chris Weidman.

Mackens Semerzier was expected to face Yuri Alcantara at the event, but was replaced by UFC newcomer Antonio Carvalho. However, Carvalho suffered an injury, and was forced out of the bout. He was replaced by newcomer Felipe Arantes.

Alexandre Ferreira was expected to face Rousimar Palhares at this event. However, Ferreira was forced out of the bout with an injury and replaced by Dan Miller.

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.

Yushin Okami (岡見 勇信, Okami Yūshin^?, born July 21, 1981) is a Japanese mixed martial artist. He currently fights at middleweight for the Ultimate Fighting Championship (UFC). Okami is currently ranked the #8 best middleweight in the world by Sherdog and the #7 best middleweight by MMAWeekly.

As an amateur, Okami fought in the pre-Pride 4 tournament, defeating two opponents before submitting Yuuki Tsutsui in the finals via triangle choke to win the tournament. He began his professional career in 2002, fighting in the GCM promotion and Pancrase as well as making an appearance at Pride The Best Vol.3, amassing a professional record of 6–0. In 2003 he competed in the ADCC Submission Wrestling World Championship, but was defeated by Matt Lindland. Also in 2003, he suffered his first professional MMA loss to Amar Suloev.

Forrest Griffin (born July 1, 1979) is an American mixed martial artist. Since 2005, he has been signed to the Ultimate Fighting Championship where he is a former UFC light heavyweight champion.

Griffin, a former Georgia police officer, first rose to prominence after winning the first season of The Ultimate Fighter. In the tournament finals, he fought and defeated Stephan Bonnar in an exciting brawl that is widely credited as sparking the current success of the UFC. He went on to serve as a coach on the 7th season of the reality series opposite Quinton Jackson, whom he later defeated at UFC 86 to become the Undisputed UFC Light Heavyweight Champion. He and Rashad Evans are the only fighters to go from winning The Ultimate Fighter to winning the UFC Light Heavyweight Championship.

Griffin graduated from Evans High School in Evans, Georgia, a suburb of Augusta. He then graduated with an A.B. in Political Science from the University of Georgia. While attending school, Griffin served as a law enforcement officer for the Richmond County Sheriff's Office in Augusta, Georgia. He also served as a patrol officer with the University of Georgia Police.

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.