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UFC 100 was a mixed martial arts event produced by the Ultimate Fighting Championship (UFC) on July 11, 2009, in Las Vegas, Nevada.. This event was the most bought UFC pay-per-view of all time with a buyrate of 1.6 million, until UFC 202 broke the record with 1.65 million.
Background. The event was officially announced in November 2015 as "UFC 197," taking place on March 5, 2016 at HSBC Arena in Rio de Janeiro, Brazil. Weeks later on December 29, UFC announced that the event was canceled and would be moved to a different location. On January 12, it was confirmed the event would take place at the MGM Grand Garden Arena in Las Vegas, Nevada.