| Sieg | 15-4 | Nikita Krylov  | TKO (Punches) |  | UFC 314: Volkanovski vs Lopes | Apr 12, 2025 | 1 | 2:24 | Miami, Florida, United States  |
| Sieg | 14-4 | Anthony Smith | TKO (Elbows and Punches) |  | UFC 310: Pantoja vs Asakura | Dec 07, 2024 | 2 | 4:46 | Las Vegas, Nevada, United States |
| Sieg | 13-4 | Dustin Jacoby | KO (Punches) |  | UFC Fight Night: Cannonier vs Imavov | Jun 08, 2024 | 1 | 2:00 | Louisville, Kentucky, United States |
| Cancelled Bout | | Carlos Ulberg  | - |  | UFC 297: Strickland vs Du Plessis | Jan 20, 2024 | - | - | Toronto, Ontario, Canada  |
| Niederlage | 12-4 | Ryan Spann | KO (Punches) |  | UFC 281: Adesanya vs Pereira | Nov 12, 2022 | 1 | 1:20 | New York City, New York, United States |
| Niederlage | 12-3 | Jiri Prochazka  | KO (Spinning Back Elbow) |  | UFC Fight Night: Reyes vs Procházka | May 01, 2021 | 2 | 4:29 | Las Vegas, Nevada, United States |
| Cancelled Bout | | Jiri Prochazka | - | | UFC Fight Night 186: Reyes vs Procházka | Feb 27, 2021 | - | - | Las Vegas, Nevada, United States |
| Niederlage | 12-2 | Jan Błachowicz  | TKO (Punches) |  | UFC 253: Adesanya vs Costa | Sep 26, 2020 | 2 | 4:36 | Abu Dhabi, Dubai, United Arab Emirates  |
| Niederlage | 12-1 | Jon Jones | Decision (Unanimous) |  | UFC 247: Jones vs Reyes | Feb 08, 2020 | 5 | 5:00 | Houston, Texas, United States |
| Sieg | 12-0 | Chris Weidman | KO (Punches) |  | UFC on ESPN2: Weidman vs Reyes | Oct 18, 2019 | 1 | 1:43 | Boston, Massachusetts, United States |
| Sieg | 11-0 | Volkan Oezdemir  | Decision (Split) |  | UFC Fight Night 147: Till vs Masvidal | Mar 16, 2019 | 3 | 5:00 | London, England, United Kingdom  |
| Sieg | 10-0 | Ovince Saint Preux | Decision (Unanimous) |  | UFC 229: Khabib vs McGregor | Oct 06, 2018 | 3 | 5:00 | Las Vegas, Nevada, United States |
| Sieg | 9-0 | Jared Cannonier | TKO (punches) |  | UFC Fight Night: Maia vs. Usman | May 19, 2018 | 1 | 2:55 | Santiago, Chile |
| Sieg | 8-0 | Jeremy Kimball | Submission (Rear-Naked Choke) |  | UFC 218 | Dec 02, 2017 | 1 | 3:39 | Detroit, Michigan, United States |
| Sieg | 7-0 | Joachim Christensen  | TKO (Punches) |  | UFC Fight Night 112: Chiesa vs Lee | Jun 25, 2017 | 1 | 0:29 | Oklahoma City, Oklahoma, United States |
| Sieg | 6-0 | Jordan Powell | KO (head kick) |  | LFA 13 | Jun 02, 2017 | 1 | 0:53 | Burbank, California, United States |
| Sieg | 5-0 | Marcus Govan | KO (head kick) |  | Hoosier Fight Club 32 | Feb 11, 2017 | 1 | 0:27 | Michigan City, Indiana, United States |
| Sieg | 4-0 | Tyler Smith | TKO (punches) |  | King of the Cage: Martial Law | Sep 18, 2016 | 1 | 1:35 | Ontario, California, United States |
| Sieg | 3-0 | Kelly Gray | Decision (unanimous) |  | King of the Cage: Sinister Intentions | Oct 17, 2015 | 3 | 5:00 | Las Vegas, Nevada, United States |
| Sieg | 2-0 | Jessie Glass | Submission (front choke) |  | Gladiator Challenge: Carnage | Apr 03, 2015 | 1 | 0:55 | Rancho Mirage, California, United States |
| Sieg | 1-0 | Jose Rivas Jr. | TKO (punches) | | King of the Cage: Fisticuffs | Dec 04, 2014 | 1 | 3:23 | Highland, California, United States |
