UFC 142: Aldo vs. Mendes was a mixed martial arts event held by the Ultimate Fighting Championship on January 14, 2012 at the HSBC Arena in Rio de Janeiro, Brazil.

UFC 141: Lesnar vs Overeem was a mixed martial arts event held by the Ultimate Fighting Championship on Friday December 30, 2011, at the MGM Grand Garden Arena in Las Vegas, Nevada.

UFC 140: Jones vs. Machida was a mixed martial arts event held by the Ultimate Fighting Championship on December 10, 2011 at the Air Canada Centre in Toronto, Ontario.

The Ultimate Fighting Championship’s first go-around in San Jose. The official attendance as recorded by the state was 13,832, slightly higher than the 13,173 initially reported by UFC president Dana White at Saturday night’s UFC 139 post-fight press conference. The official total included 9,496 in paid attendance with 4,336.

UFC 138: Leben vs. Muñoz was a mixed martial arts event held by the Ultimate Fighting Championship on November 5, 2011 at LG Arena in Birmingham, England.

UFC 137: Penn vs. Diaz was a mixed martial arts event held by the Ultimate Fighting Championship on October 29, 2011 at Mandalay Bay Events Center in Las Vegas, Nevada

UFC 136: Edgar vs. Maynard III was a mixed martial arts event held by the Ultimate Fighting Championship on October 8, 2011, at the Toyota Center in Houston, Texas....

UFC 135 Results - UFC 135 went off live on September 24, 2011, from the Pepsi Center in Denver, Colorado

UFC 134: Silva vs. Okami (also known as UFC Rio) 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.

UFC 133: Evans vs. Ortiz was a mixed martial arts event held by the Ultimate Fighting Championship on August 6, 2011 at the Wells Fargo Center in Philadelphia, Pennsylvania, United States.

UFC 132: Cruz vs. Faber was a mixed martial arts event held by the Ultimate Fighting Championship on July 2, 2011 at the MGM Grand Garden Arena in Las Vegas, Nevada, United States.

UFC 131: Dos Santos vs. Carwin was a mixed martial arts event held by the Ultimate Fighting Championship on June 11, 2011 at the Rogers Arena in Vancouver, British Columbia.

This event was to be the third meeting between Frankie Edgar and Gray Maynard and their second meeting for the UFC Lightweight Championship. The two met earlier this year at UFC 125: Resolution with the fight ending in a split draw, and Edgar retaining his title. Their first encounter at UFC Fight Night: Florian vs. Lauzon saw Maynard win via unanimous decision.

The event was the sixth that the UFC has hosted in Canada and the first in Ontario since mixed martial arts was legalized in the province in August 2010.  The Toronto event was originally titled UFC 131 by the promotion, but later changed to UFC 129 as its early 2011 schedule started to fall more firmly into place.

Diego Sanchez will return to his roots during the UFC 129 weekend and compete in a 4-man grappling tournament.