Ken Hasegawa (born February 26, 1987) was born in Kanagawa prefecture of Japan. His father is a Moroccan, and his mother is born and raised in Japan.

Upon entering high school, Ken began training in judo, and continued at Yamanashigakuin University where he became certified athlete of All Japan Judo Federation.

After graduating from the university Ken became a full-time employee of Nippon Express but kept on training.

One day, his friend recommended Ken to compete at the underground MMA show just to make a quick buck.

He took friend's advise, competed at A.R.T. 2010 All Japan Real Fighting Tournament by Kingdom Ehrgeiz, and even in the final, Ken easily won by less than one minute.

Ken realized his own potential, and started compete for the DEEP Fighting Championship from his second pro fight.

After winning five fights in a row, Ken got a call to fight in the tournament to decide the DEEP Megaton (openweight) champion. Ken conquered this tournament and won the first title of his pro MMA career.

In 2014, Ken defeated UFC / PRIDE veteran Kazuhiro Nakamura, followed by North American debut in Titan Fighting Championship.

With the record of 12 wins and 1 draw, Ken signed with the RIZIN Fighting Federation, faced Brennan Ward.

Ken won next four out of five fights and in 2018, he signed with the ONE Championship.

In the promotional debut, Ken fought ONE middleweight champion Aung La Nsang, took the champion to fifth round. Ken did come up short at the end but this fight is considered as one of the best fights in the history of the ONE Championship.

Ken is also an entrepreneur in the Japanese MMA scene.

He is the creator of ONE TV on YouTube. This channel does more than just introducing fighters by uploading videos hosted by Ken himself. The channel provides MVP awards, with cash rewards, to fighters in various MMA events in Japan. In addition, ONE TV create / sponsor grappling bouts in those MMA events, providing fighters opportunities to keep themselves active and earn extra income while waiting for their MMA fight to be confirmed.

​

MMA record: 16-4-1 / height: 5'11" (181 cm) / weight: 205 lbs (93 kg)