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UFC 143: Diaz vs. Condit took place on February 4, 2012 at the Mandalay Bay Events Center in Las Vegas, Nevada.
UFC 143: Diaz vs. Condit officially drew 9,015 attendees and generated a live gate of $2,389,975. The Preliminary bouts on FX drew 1.4 million viewers.
UFC 143 Post Fight Analysis
UFC 143 MMA Decisions
UFC 143 Play-by-Play
UFC 143 Tapology UFC 143 Pre-Fight Analysis
| Match | Winner | Loser | Method | Round | Time |
| 1 | Stephen Thompson | Daniel Stittgen | KO (Head Kick) | 1 | 4:13 |
| 2 | Rafael Natal | Michael Kuiper | Decision (Unanimous) | 3 | 5:00 |
| 3 | Matt Riddle | Henry Martinez | Decision (Split) | 3 | 5:00 |
| 4 | Matt Brown | Chris Cope | TKO (Punches) | 2 | 1:19 |
| 5 | Edwin Figueroa | Alex Caceres | Decision (Split) | 3 | 5:00 |
| 6 | Dustin Poirier | Max Holloway | Submission (Triangle Armbar) | 1 | 3:23 |
| 7 | Ed Herman | Clifford Starks | Submission (Rear-Naked Choke) | 2 | 1:43 |
| 8 | Renan Pegado | Scott Jorgensen | Decision (Unanimous) | 3 | 5:00 |
| 9 | Josh Koscheck | Mike Pierce | Decision (Split) | 3 | 5:00 |
| 10 | Fabricio Werdum | Roy Nelson | Decision (Unanimous) | 3 | 5:00 |
| 11 | Carlos Condit | Nick Diaz | Decision (Unanimous) | 5 | 5:00 |
Interim Welterweight Championship bout: Carlos Condit defeated Nick Diaz via unanimous decision (48-47, 49-46, 49-46) to become the new UFC Interim Welterweight Champion.
Heavyweight bout: Fabricio Werdum defeated Roy Nelson via unanimous decision (30-27, 30-27, 30-27).
Welterweight bout: Josh Koscheck defeated Mike Pierce via split decision (29-28, 29-28, 28-29).
Bantamweight bout: Renan Barão defeated Scott Jorgensen via unanimous decision (30-27, 30-27, 30-27).
Middleweight bout: Ed Herman defeated Clifford Starks via submission (rear-naked choke) at 1:43 of round 2.
Featherweight bout: Dustin Poirier defeated Max Holloway via submission (triangle armbar) at 3:23 of round 1.
Bantamweight bout: Edwin Figueroa defeated Alex Caceres via split decision (28-27, 28-27, 27-28).
Welterweight bout: Matt Brown defeated Chris Cope via KO (punches) at 1:19 of round 2.
Welterweight bout: Matthew Riddle defeated Henry Martinez via split decision (29-28, 28-29, 28-29).
Middleweight bout: Rafael Natal defeated Michael Kuiper via unanimous decision (30–27, 30–27, 29–28).
Welterweight bout: Stephen Thompson defeated Dan Stittgen via KO (head kick) at 4:13 of round 1.
Watch the live video stream of the weigh-ins.
