The Ultimate Fighting Championship (UFC) is a mixed martial arts promotion company. It is the largest in the world and features most of the top-ranked fighters in the sport. Based in the United States, the UFC produces events worldwide that showcase ten weight divisions and abide by the Unified Rules of Mixed Martial Arts. The UFC has held over 300 events to date. Dana White serves as the president of the UFC while brothers Frank and Lorenzo Fertitta control the UFC's parent company, Zuffa, LLC.

The first Ultimate Fighting Championship event was held on November 12, 1993 at the McNichols Sports Arena in Denver, Colorado. The purpose of the early Ultimate Fighting Championship competitions were to identify the most effective martial art in a fight, with minimal rules, between competitors of different fighting disciplines, including boxing, Brazilian jiu-jitsu, Sambo, wrestling, Muay Thai, karate, judo, and other styles. In subsequent competitions, fighters began adopting effective techniques from more than one discipline, which indirectly helped create an entirely separate style of fighting known as present-day mixed martial arts.

UFC 177: Dillashaw vs. Soto was a mixed martial arts event held on August 30, 2014 at the Sleep Train Arena in Sacramento, California.

Background

The event was originally planned to take place at the MGM Grand Garden Arena in Las Vegas, Nevada, with a Light Heavyweight Championship rematch between the champion at the time Jon Jones and challenger Alexander Gustafsson targeted as the event headliner. However, that bout was pushed back a month and scheduled to headline UFC 178.

A Bantamweight Championship rematch between current champion T.J. Dillashaw and former champion Renan Barão was expected to headline this show. Their first fight, contested at UFC 173, ended in a fifth round TKO victory for Dillashaw. However, the day of the weigh ins, Barão had to be admitted to the hospital as a result of his attempts to cut weight. Dillashaw faced UFC newcomer Joe Soto in the main event. Subsequently, Soto's opponent, Anthony Birchak, was removed from the card entirely.

Demetrious Johnson was expected to defend his Flyweight Championship against Chris Cariaso in the co-main event. However, on August 12, it was announced that bout would be moved to headline UFC 178 after Jon Jones against Daniel Cormier was delayed due to injury.

UFC 158: St-Pierre vs. Diaz was a mixed martial arts event held by the Ultimate Fighting Championship on March 16, 2013 at the Bell Centre in Montreal, Quebec, Canada.

Background

The main event was the culmination of the rivalry between Georges St-Pierre and Nick Diaz, with the latter having been vocal in wanting to fight the current champion for nearly two years.

A rematch between Alessio Sakara and Patrick Côté, from UFC 154, was briefly linked to this event. However, Sakara was forced out of the bout due to renal stress.

Sean Pierson was expected to face Rick Story at the event. However, Pierson pulled out of the bout citing an injury and was replaced by Quinn Mulhern.

Rory MacDonald was originally scheduled to face Carlos Condit in a rematch. However, on February 18, it was announced that MacDonald pulled out of the bout citing a neck injury. Condit instead faced Johny Hendricks, who was pulled from his bout with Jake Ellenberger. Ellenberger then faced returning veteran Nate Marquardt.