UFC on Fox 3: Diaz vs. Miller took place on May 5, 2012 at IZOD Center in East Rutherford, N.J.
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UFC on FOX 3: Diaz vs. Miller drew a reported 10,788 attendees to IZOD Center in East Rutherford, N.J., and generated a live gate of $1.1 million. The preliminary card broadcast on Fuel TV averaged 86,000 viewers.
UFC on Fox 3 Post Fight Analysis
UFC on Fox 3 MMA Decisions
UFC on Fox 3 Play-by-Play
UFC on Fox 3 Tapology UFC on Fox 3 Pre-Fight Analysis
| Match | Winner | Loser | Method | Round | Time |
| 1 | Karlos Vemola | Mike Massenzio | Submission (Rear-Naked Choke) | 2 | 1:07 |
| 2 | Nick Denis | Roland Delorme | Submission (Rear-Naked Choke) | 1 | 4:59 |
| 3 | Dennis Bermudez | Pablo Garza | Decision (Unanimous) | 5 | 5:00 |
| 4 | Danny Castillo | John Cholish | Decision (Unanimous) | 5 | 5:00 |
| 5 | Louis Gaudinot | John Lineker | Technical Submission (Guillotine Choke) | 2 | 4:54 |
| 6 | John Hathaway | Pascal Krauss | Decision (Unanimous) | 5 | 5:00 |
| 7 | John Dodson | Timothy Elliott | Decision (Unanimous) | 5 | 5:00 |
| 8 | Michael Johnson | Tony Ferguson | Decision (Unanimous) | 5 | 5:00 |
| 9 | Lavar Johnson | Pat Barry | TKO (Punches) | 1 | 4:38 |
| 10 | Alan Belcher | Rousimar Palhares | TKO (Punches and Elbows) | 1 | 4:18 |
| 11 | Johny Hendricks | Josh Koscheck | Decision (Split) | 5 | 5:00 |
| 12 | Nate Diaz | Jim Miller | Submission (Guillotine Choke) | 2 | 4:09 |
