Duffee began his career 6-0, all wins coming by knockout and only one getting out of the first round. He set a UFC record in his debut with the promotion by knocking out Tim Hague in just 7 seconds. In his second UFC fight, he was beating Mike Russow convincingly before being caught in the temple by a Russow right in the 3rd round and suffering his first loss.
| Career Statistics: | |
| Knockout Wins: 2 (25%) | Knockout Losses: 2 (25%) |
| TKO Wins: 4 (50%) | TKO Losses: 0 (0%) |
| Submission Wins: 0 (0%) | Submission Losses: 0 (0%) |
| Decision Wins: 0 (0%) | Decision Losses: 0 (0%) |
| Draws: 0 | No Contests: 0 |
| Career Fights: | |||||
| Opponent | Method | Event | Date | Rnd | |
| Loss | Alistair Overeem | Knockout | K-1: Dynamite!! Power of Courage 2010 | Dec. 31, 2010 | 1 |
| Loss | Mike Russow | Knockout | UFC 114: Rampage vs. Evans | May. 29, 2010 | 3 |
| Win | Tim Hague | Knockout | UFC 102: Couture vs. Nogueira | Aug. 29, 2009 | 1 |
| Win | Assuerio Silva | Technical Knockout | JF 11: Jungle Fight 11 | Sep. 13, 2008 | 2 |
| Win | Josh Bennett | Knockout | ANFC 2: Alianza National Full Contact 2 | Aug. 08, 2008 | 1 |
| Win | Mark Honneger | Technical Knockout | CHF: Crazy Horse Fights | Dec. 11, 2007 | 1 |
| Win | Mike Walbright | Technical Knockout | ISCF: Head-On Collision | Jun. 01, 2007 | 1 |
| Win | Jonathan Spears | Technical Knockout | ISCF: Invasion | Feb. 09, 2007 | 1 |
| Total Fights: 8 | Record: 6 - 2 | |||||
Quarterly Rankings
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