2016 and 2018). Championships and Accomplishments Konfrontacja Sztuk Walki KSW Heavyweight Championship (1 time, current) Eight successful title defenses Submission of the Night (two times) Mixed martial arts record |- |Win |align=center|23–6 (1) |Todd Duffee |TKO (punches) |KSW 79: De Fries vs. Duffee | |align=center|1 |align=center|3:46 |Liberec, Czech Republic | |- |Win |align=center| |Ricardo Prasel |Submission (rear-naked choke) |KSW 74: De Fries vs. Prasel | |align=center|1 |align=center|4:10 |Ostrów Wielkopolski, Poland | |- |Win |align=center|21–6 (1) |Darko Stošić |TKO (submission to punches) |KSW 67: De Fries vs. Stošić | |align=center|5 |align=center|3:44 |Warsaw, Poland | |- |Win |align=center|20–6 (1) |Tomasz Narkun |TKO (punches) |KSW 60: De Fries vs. Narkun 2 | |align=center|2 |align=center|3:37 |Łódź, Poland | |- |Win |align=center| 19–6 (1) |Michał Kita |TKO (punches) |KSW 57: De Fries vs. Kita | |align=center|2 |align=center|0:59 |Łódź, Poland | |- |Win |align=center| 18–6 (1) |Luis Henrique |Decision (split) |KSW 50: London | |align=center|5 |align=center|5:00 |London, England | |- | Win | align=center| 17–6 (1) |Tomasz Narkun | Decision (unanimous) |KSW 47: The X-Warriors | | align=center| 5 | align=center| 5:00 | Łódź, Poland | |- |- | Win |align=center|16–6 (1) | Karol Bedorf | Submission (americana) |KSW 45: The Return to Wembley | |align=center| 2 |align=center| 4:26 |London, England | |- | Win |align=center|15–6 (1) | Michał Andryszak | TKO (punches) |KSW 43: Soldić vs. Du Plessis | |align=center| 1 |align=center| 3:32 |Wrocław, Poland | |- |- | Win |align=center|14–6 (1) | James Thompson | Submission (guillotine choke) |Bellator 191 | |align=center| 1 |align=center| 1:33 |Newcastle, England | |- | Win |align=center|13–6 (1) | Anton Vyazigin | Decision (majority) |M-1 Challenge 84: Kunchenko vs. Romanov | |align=center| 3 |align=center| 5:00 |Saint Petersburg, Russia | |- | Loss |align=center|12–6 (1) |Ivan Shtyrkov |TKO (elbows and punches) |RCC Boxing Promotions: Day of Victory 72 | |align=center| 1 |align=center| 1:51 |Yekaterinburg, Russia | |- | Win |align=center|12–5 (1) | Thomas Denham | TKO (punches) |M4tC 22: Warriors | |align=center| 1 |align=center| 1:37 |Tyne and Wear, England | |- | Loss |align=center|11–5 (1) | Thomas Denham | TKO (punches) |M4tC 16: Invasion | |align=center| 1 |align=center| 1:01 |Tyne and Wear, England | |- | Win |align=center|11–4 (1) | Łukasz Parobiec | Submission (rear-naked choke) |M4tC 15: Bad Blood | |align=center| 1 |align=center| 2:03 |Tyne and Wear, England | |- | Loss |align=center|10–4 (1) | Satoshi Ishii | Decision (unanimous) |Inoki Genome Fight 1 | |align=center| 2 |align=center| 5:00