A professional competitor since 2010, he formerly competed for Ultimate Fighting Championship, Shooto, Deep, and Vale Tudo Japan.

Born and raised in Shizuoka, Sasaki was a talented wrestler and also began training in Brazilian jiu-jitsu from a young age.

[6] Sasaki faced current ZST 132 lb champion Keisuke Fujiwara[7] on January 13, 2014, at Shooto: 1st Round 2014.

[16] However, on November 3, Nicolau was pulled from the bout after USADA revealed a potential anti-doping violation from a sample taken October 13.

However, Sasaki was forced to withdraw from the bout due to a visceral injury and was replaced by Justin Scoggins.

[37] After recovering from two jaw surgeries to repair the damage sustained in his previous fight, Sasaki faced Kenta Takizawa at Rizin 26 on December 31, 2020.

[47] On October 23, 2023, Sasaki himself made an announcement that he would be participating in an exhibition match for Pro Wrestling Noah's November 13 episode of Monday Magic.

In a statement made during the October 23 show, he specified that it had been a long-held aspiration of his to perform in Noah, as he had been a devoted fan of the promotion since childhood.

[48] He officially made his professional wrestling debut at Noah The New Year 2024 event on January 2, 2024, but was defeated by Takashi Sugiura.

[49] On September 13, 2024, at Destination 2024, he defeated Hayata via referee stoppage to win the GHC National Championship, claiming his first wrestling title.

His victory, achieved just six months after his debut, set a record for the fastest title win in the history of the championship.

[50] On October 14, 2024, it was announced that Sasaki would face WWE's Shinsuke Nakamura at Noah The New Year 2025 on January 1, 2025.

He has expressed his fondness for this mythical creature and often wears a long-nosed Tengu mask during his professional wrestling entrances.

[52][1] In a November 2023 interview, he stated that witnessing the match between Great Muta and Shinsuke Nakamura at Noah The New Year 2023 left a deep impression on him and inspired his decision to pursue a career in professional wrestling.