
Ken Hasegawa| Result | Opponent | Weight | # | Method | Event | Date | Location |
|---|---|---|---|---|---|---|---|
| Loss | Aung La Nsang | 205 lb | ![]() |
TKO (punches), R2 (4:41) | ONE Championship: A New Era | 2019-03-31 | Tokyo, Japan |
| Loss | Brennan Ward | 187 lb | Submission (rear naked choke), R2 (1:52) | Rizin FF: Iza no Mai | 2015-12-31 | Saitama, Japan |
2019-03-31 - ONE Championship: A New Era -
Tokyo, Japan
Tokyo, Japan
| Result | Opponent | Weight | # | Method | Event | Date | Location |
|---|---|---|---|---|---|---|---|
| Loss | Aung La Nsang | 205 lb | ![]() |
TKO (punches), R2 (4:41) | ONE Championship: A New Era | 2019-03-31 | Tokyo, Japan |
| Loss | Brennan Ward | 187 lb | Submission (rear naked choke), R2 (1:52) | Rizin FF: Iza no Mai | 2015-12-31 | Saitama, Japan |
ONE Middleweight Championship (205 lb / 93 kg) 
~
Winner: Aung La Nsang via TKO (punches) in round 2 (4:41)
| User #1 | Aung La Nsang via Decision | |||
| User #2 | Aung La Nsang via TKO in round 2 | |||
| User #3 | Aung La Nsang via TKO in round 2 |

| Result | Opponent | Weight | # | Method | Event | Date | Location |
|---|---|---|---|---|---|---|---|
| Loss | Reinier de Ridder | 225 lb | ![]() |
Decision (unanimous) | ONE Championship on TNT 4 | 2021-04-28 | Singapore, Singapore |
| Win | Brandon Vera | 225 lb | ![]() |
TKO (punches), R2 (3:23) | ONE Championship: Century | 2019-10-13 | Tokyo, Japan |
| Win | Ken Hasegawa | 205 lb | ![]() |
TKO (punches), R2 (4:41) | ONE Championship: A New Era | 2019-03-31 | Tokyo, Japan |
ONE Middleweight Championship (205 lb / 93 kg) 
~
Winner: Aung La Nsang via TKO (punches) in round 2 (4:41)
| User #1 | Aung La Nsang via Decision |
| User #2 | Aung La Nsang via TKO in round 2 |
| User #3 | Aung La Nsang via TKO in round 2 |
2015-12-31 - Rizin FF: Iza no Mai -
Saitama, Japan
Saitama, Japan
| Result | Opponent | Weight | # | Method | Event | Date | Location |
|---|---|---|---|---|---|---|---|
| Loss | Aung La Nsang | 205 lb | ![]() |
TKO (punches), R2 (4:41) | ONE Championship: A New Era | 2019-03-31 | Tokyo, Japan |
| Loss | Brennan Ward | 187 lb | Submission (rear naked choke), R2 (1:52) | Rizin FF: Iza no Mai | 2015-12-31 | Saitama, Japan |
Catchweight (187 lb / 85 kg)
~
~
Winner: Brennan Ward via Submission (rear naked choke) in round 2 (1:52)
| User #1 | Ken Hasegawa via Decision | |||
| User #2 | Brennan Ward via TKO in round 1 | |||
| User #3 | Brennan Ward via TKO in round 1 |

| Result | Opponent | Weight | # | Method | Event | Date | Location |
|---|---|---|---|---|---|---|---|
| Loss | Logan Storley | 170 lb | ![]() |
TKO (punches), R2 (4:05) | Bellator 298: Storley vs. Ward | 2023-08-11 | Sioux Falls, South Dakota, USA |
| Win | Sabah Homasi | 170 lb | TKO (head kick and punches), R2 (1:34) | Bellator 290: Bader vs. Fedor 2 | 2023-02-04 | Inglewowod, California, USA |
|
| Win | Kassius Kayne | 170 lb | TKO (punches), R2 (1:11) | Bellator 282: Mousasi vs. Eblen | 2022-06-24 | Uncasville, Connecticut, USA |
|
| Loss | Fernando Gonzalez | 178 lb | Submission (guillotine choke), R3 (1:02) | Bellator 182: Koreshkov vs. Njokuani | 2017-08-25 | Verona, New York, USA |
|
| Loss | Paul Daley | 170 lb | KO (flying knee), R1 (2:27) | Bellator 170: Ortiz vs. Sonnen | 2017-01-21 | Inglewood, California, USA |
|
| Win | Saad Awad | 170 lb | KO (punches), R1 (1:26) | Bellator 163: McGeary vs. Davis | 2016-11-04 | Uncasville, Connecticut, USA |
|
| Loss | Evangelista Santos | 170 lb | Verbal Submission (heel hook), R1 (0:30) | Bellator 153: Koreshkov vs. Henderson | 2016-04-22 | Uncasville, Connecticut, USA |
|
| Win | Ken Hasegawa | 187 lb | Submission (rear naked choke), R2 (1:52) | Rizin FF: Iza no Mai | 2015-12-31 | Saitama, Japan |
|
| Win | Dennis Olson | 170 lb | TKO (punches), R1 (4:37) | Bellator 144: Galvao vs. Dantas 2 | 2015-10-23 | Uncasville, Connecticut, USA |
|
| Win | Roger Carroll | 170 lb | KO (punch), R1 (2:06) | Bellator 140: Lima vs. Koreshkov | 2015-07-17 | Uncasville, Connecticut, USA |
|
| Win | Curtis Millender | 170 lb | Submission (rear naked choke), R1 (1:39) | Bellator 134: The British Invasion | 2015-02-27 | Uncasville, Connecticut, USA |
|
| Loss | Alexander Shlemenko | 185 lb | ![]() |
Submission (guillotine choke), R2 (1:22) | Bellator 114 | 2014-03-28 | West Valley City, Utah, USA |
| Win | Mikkel Parlo | 185 lb | ![]() |
TKO (punches), R2 (1:39) | Bellator 107 | 2013-11-08 | Thackerville, California, USA |
| Win | Joe Pacheco | 185 lb |
| Submission (guillotine choke), R2 (2:41) | Bellator 102 | 2013-10-04 | Visalia, California, USA |
| Win | Justin Torrey | 185 lb |
| TKO (punches), R2 (3:28) | Bellator 98 | 2013-09-07 | Uncasville, Connecticut, USA |
Catchweight (187 lb / 85 kg)
~
~
Winner: Brennan Ward via Submission (rear naked choke) in round 2 (1:52)
| User #1 | Ken Hasegawa via Decision |
| User #2 | Brennan Ward via TKO in round 1 |
| User #3 | Brennan Ward via TKO in round 1 |
Tue 23:21
Tue 13:21 - Tue 16:21
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