UFC 142: Aldo vs. Mendes took place on January 14, 2012 at the HSBC Arena in Rio de Janeiro, Brazil.
UFC’s first Prelim special on FX drew 880,000 viewers.
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UFC 142 Post Fight Analysis
UFC 142 MMA Decisions
UFC 142 Play-by-Play
UFC 142 Tapology UFC 142 Pre-Fight Analysis
| Match | Winner | Loser | Method | Round | Time |
| 1 | Felipe Arantes | Antonio Carvalho | Decision (Unanimous) | 3 | 5:00 |
| 2 | Mike Pyle | Ricardo Funch | TKO (Knee and Punches) | 1 | 1:22 |
| 3 | Yuri Alcantara | Michihiro Omigawa | Decision (Unanimous) | 3 | 5:00 |
| 4 | Gabriel Gonzaga | Ednaldo Oliveira | Submission (Rear-Naked Choke) | 1 | 3:22 |
| 5 | Thiago Tavares | Sam Stout | Decision (Unanimous) | 3 | 5:00 |
| 6 | Edson Barboza | Terry Etim | KO (Spinning Wheel Kick) | 3 | 2:02 |
| 7 | Carlo Prater | Erick Silva | DQ (Punches to Back of Head) | 1 | 0:29 |
| 8 | Rousimar Palhares | Mike Massenzio | Submission (Heel Hook) | 1 | 1:03 |
| 9 | Vitor Belfort | Anthony Johnson | Submission (Rear-Naked Choke) | 1 | 4:49 |
| 10 | Jose Aldo | Chad Mendes | KO (Knee) | 1 | 4:59 |
