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.

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.

Erick Silva (born June 21, 1984) is a Brazilian professional mixed martial artist who competes in the welterweight division. A professional MMA competitor since 2005, Silva has spent the majority of his career in Brazil, mostly notably for Jungle Fight where he was the inaugural Welterweight champion.

Silva comes from Vila Velha, Brazil and was an X-Gym training partner for the likes of Anderson Silva, Rafael Feijao and Jacare Souza. He also trains with Team Nogueira and Pro Fight.

Silva joined Jungle Fight, appearing at Jungle Fight 9 against Carlos Eduardo dos Santos. In the third and final round, Silva defeated dos Santos via rear naked choke.

At Jungle Fight 11, he defeated Igor Fernandes via unanimous decision. Silva followed that up with two further victories in the promotion.

Silva then competed in one of the more unique fights in his career, at Jungle Fight 17, which was held outdoors. On the day of the event, the weather was clear throughout, until less than an hour before the start, when rain began to fall and never stopped. The event, which went down as one of the wettest in MMA history was not a successful one for Silva who hit his downed opponent with a knee, resulting in a no contest verdict.