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Khalil Ibn Rountree Jr. (born February 26, 1990) is an American professional mixed martial artist who currently competes in the Light Heavyweight division of the Ultimate Fighting Championship (UFC). As of October 28, 2025, he is #4 in the UFC light heavyweight rankings.
| 22 matches | 14 wins | 7 losses |
| By knockout | 9 | 4 |
| By submission | 0 | 1 |
| By decision | 5 | 2 |
| No contests | 1 | |
| Res. | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Loss | 14–7 (1) | Jiří Procházka | KO (punches) | UFC 320 | October 4, 2025 | 3 | 3:04 | Las Vegas, Nevada, United States | Fight of the Night. |
| Win | 14–6 (1) | Jamahal Hill | Decision (unanimous) | UFC on ABC: Hill vs. Rountree Jr. | June 21, 2025 | 5 | 5:00 | Baku, Azerbaijan | |
| Loss | 13–6 (1) | Alex Pereira | TKO (punches) | UFC 307 | October 5, 2024 | 4 | 4:32 | Salt Lake City, Utah, United States | For the UFC Light Heavyweight Championship. Fight of the Night. |
| Win | 13–5 (1) | Anthony Smith | TKO (punches) | UFC Fight Night: Song vs. Gutiérrez | December 9, 2023 | 3 | 0:56 | Las Vegas, Nevada, United States | Performance of the Night. |
| Win | 12–5 (1) | Chris Daukaus | TKO (punches) | UFC on ESPN: Luque vs. dos Anjos | August 12, 2023 | 1 | 2:40 | Las Vegas, Nevada, United States | Performance of the Night. |
| Win | 11–5 (1) | Dustin Jacoby | Decision (split) | UFC Fight Night: Kattar vs. Allen | October 29, 2022 | 3 | 5:00 | Las Vegas, Nevada, United States | |
| Win | 10–5 (1) | Karl Roberson | TKO (body kick and punches) | UFC Fight Night: Santos vs. Ankalaev | March 12, 2022 | 2 | 0:25 | Las Vegas, Nevada, United States | Performance of the Night. |
| Win | 9–5 (1) | Modestas Bukauskas | TKO (leg kick) | UFC Fight Night: Brunson vs. Till | September 4, 2021 | 2 | 2:30 | Las Vegas, Nevada, United States | |
| Loss | 8–5 (1) | Marcin Prachnio | Decision (unanimous) | UFC 257 | January 24, 2021 | 3 | 5:00 | Abu Dhabi, United Arab Emirates | |
| Loss | 8–4 (1) | Ion Cuțelaba | TKO (elbows) | UFC Fight Night: Hermansson vs. Cannonier | September 28, 2019 | 1 | 2:35 | Copenhagen, Denmark | |
| Win | 8–3 (1) | Eryk Anders | Decision (unanimous) | UFC 236 | April 13, 2019 | 3 | 5:00 | Atlanta, Georgia, United States | |
| Loss | 7–3 (1) | Johnny Walker | KO (elbow) | UFC Fight Night: Magny vs. Ponzinibbio | November 17, 2018 | 1 | 1:57 | Buenos Aires, Argentina | |
| Win | 7–2 (1) | Gökhan Saki | TKO (punches) | UFC 226 | July 7, 2018 | 1 | 1:36 | Las Vegas, Nevada, United States | Performance of the Night. |
| NC | 6–2 (1) | Michał Oleksiejczuk | NC (overturned) | UFC 219 | December 30, 2017 | 3 | 5:00 | Las Vegas, Nevada, United States | Originally a unanimous decision win for Oleksiejczuk; overturned after he tested positive for clomiphene. |
| Win | 6–2 | Paul Craig | KO (punches) | UFC Fight Night: Nelson vs. Ponzinibbio | July 16, 2017 | 1 | 4:56 | Glasgow, Scotland | |
| Win | 5–2 | Daniel Jolly | KO (knee) | UFC Fight Night: Bermudez vs. The Korean Zombie | February 4, 2017 | 1 | 0:52 | Houston, Texas, United States | |
| Loss | 4–2 | Tyson Pedro | Submission (rear-naked choke) | UFC Fight Night: Whittaker vs. Brunson | November 27, 2016 | 1 | 4:07 | Melbourne, Australia | |
| Loss | 4–1 | Andrew Sanchez | Decision (unanimous) | The Ultimate Fighter: Team Joanna vs. Team Cláudia Finale | July 8, 2016 | 3 | 5:00 | Las Vegas, Nevada, United States | Return to Light Heavyweight. The Ultimate Fighter 23 Light Heavyweight Tournament Final. |
| Win | 4–0 | Justin Polendey | KO (punch) | RFA 33 | December 11, 2015 | 1 | 1:42 | Costa Mesa, California, United States | |
| Win | 3–0 | Cameron Olson | Decision (unanimous) | RFA 25 | April 10, 2015 | 3 | 5:00 | Sioux Falls, South Dakota, United States | Middleweight debut. |
| Win | 2–0 | Blake Troop | KO (punch) | RFA 21 | December 5, 2014 | 1 | 0:39 | Costa Mesa, California, United States | Catchweight (190 lb) bout. |
| Win | 1–0 | Livingston Lukow | Decision (unanimous) | RFA 15 | June 6, 2014 | 3 | 5:00 | Culver City, California, United States | Light Heavyweight debut. |
| Exhibition record breakdown | ||
| 3 matches | 2 wins | 1 loss |
| By knockout | 2 | 0 |
| By submission | 0 | 1 |
| Res. | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Win | 2–1 | Josh Stansbury | TKO (punches) | The Ultimate Fighter: Team Joanna vs. Team Cláudia | July 6, 2016 (airdate) | 1 | 4:15 | Las Vegas, Nevada, United States | The Ultimate Fighter 23 Semifinal round. Rountree was brought back into competition after an injury to another contestant. |
| Loss | 1–1 | Cory Hendricks | Submission (rear-naked choke) | April 27, 2016 (airdate) | 1 | 2:34 | The Ultimate Fighter 23 Quarterfinal round. | ||
| Win | 1–0 | Muhammed Dereese | TKO (punches and soccer kicks to the body) | April 20, 2016 (airdate) | 2 | 0:38 | The Ultimate Fighter 23 Elimination round |
| Amateur record breakdown | ||
| 6 matches | 6 wins | 0 losses |
| By knockout | 4 | 0 |
| By submission | 1 | 0 |
| By decision | 1 | 0 |
| Res. | Record | Opponent | Method | Event | Date | Round | Time | Location | Notes |
| Win | 6–0 | Dylan Jahrling | KO (punch) | Tuff-N-Uff: Future Stars of MMA 20 | July 5, 2013 | 1 | 1:47 | Las Vegas, Nevada, United States | Won the Tuff-N-Uff Amateur Middleweight Championship. |
| Win | 5–0 | Lee Cordova | Submission (guillotine choke) | Tuff-N-Uff: Festibrawl 6 | May 26, 2013 | 1 | 0:49 | Las Vegas, Nevada, United States | |
| Win | 4–0 | Prentice Williams | Decision (unanimous) | Tuff-N-Uff: Knock Out Cancer 2 | October 11, 2012 | 3 | 3:00 | Las Vegas, Nevada, United States | |
| Win | 3–0 | Giovani Zavala | TKO (knee and punches) | Tuff-N-Uff: Beauties and Beasts | January 27, 2012 | 1 | 0:30 | Las Vegas, Nevada, United States | |
| Win | 2–0 | Niels Berlemann | KO (punch) | KOTC: Future Legends 2 | June 4, 2011 | 1 | 0:16 | Las Vegas, Nevada, United States | |
| Win | 1–0 | Travis Jelmyer | TKO (punches) | Tuff-N-Uff: Future Stars of MMA 15 | March 12, 2011 | 1 | 0:21 | Las Vegas, Nevada, United States |
| No. | Event | Fight | Date | Venue | City | PPV buys |
| 1. | UFC 307 | Pereira vs. Rountree Jr. | October 5, 2024 | Delta Center | Salt Lake City, Utah, United States | Not Disclosed |