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.

[3] It was the first UFC event of the year, and was broadcast live on pay-per-view in North America.

[6] Paulo Thiago was scheduled to face Mike Pyle, but pulled out of the bout due to an injury.

[9] At the UFC 142 weigh ins, Anthony Johnson failed to make the middleweight limit.

Johnson officially weighed in at 204.2 lb on fight day, and the bout took place as scheduled.