UFC 137: Penn vs. Diaz took place on October 29, 2011, at Mandalay Bay Events Center in Las Vegas, Nevada. The event was originally to be headlined by St-Pierre vs. Condit, however, Georges St-Pierre was forced out of the title bout due to a knee injury.
Two preliminary bouts were televised live on Spike TV and the remaining 4 preliminary bouts were streamed live on Facebook.
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UFC 137: Penn vs. Diaz officially drew a 10,313 attendance figure and a $3,900,650 live gate. Spike TV’s preliminary bouts drew 1.1 million viewers and an overall 0.8 household rating.
UFC 137 Post Fight Analysis
UFC 137 Tapology UFC 137 Pre-Fight Analysis
| Match | Winner | Loser | Method | Round | Time |
| 1 | Clifford Starks | Dustin Jacoby | Decision (Unanimous) | 3 | 5:00 |
| 2 | Francis Carmont | Chris Camozzi | Decision (Unanimous) | 3 | 5:00 |
| 3 | Ramsey Nijem | Daniel Downes | Decision (Unanimous) | 3 | 5:00 |
| 4 | Brandon Vera | Eliot Marshall | Decision (Unanimous) | 3 | 5:00 |
| 5 | Bart Palaszewski | Tyson Griffin | KO (Punches) | 1 | 2:45 |
| 6 | Donald Cerrone | Dennis Siver | Submission (Rear-Naked Choke) | 1 | 2:22 |
| 7 | Hatsu Hioki | George Roop | Decision (Split) | 3 | 5:00 |
| 8 | Scott Jorgensen | Jeff Curran | Decision (Unanimous) | 3 | 5:00 |
| 9 | Roy Nelson | Mirko Filipovic | TKO (Punches) | 3 | 1:30 |
| 10 | Cheick Kongo | Matt Mitrione | Decision (Unanimous) | 3 | 5:00 |
| 11 | Nick Diaz | B.J. Penn | Decision (Unanimous) | 3 | 5:00 |
