Ota began participating in major international and domestic wrestling tournaments while attending the Nippon Sport Science University.

[2] Ota took part in the 2016 Asian Olympic qualifier tournament, held between March 18–20, 2021, competing in the 59 kg Greco Roman event.

He was scheduled to face the six-time world champion and 2012 Olympic gold medalist Hamid Sourian in the opening round.

He beat Almat Kebispayev 6–0 in the next round, Stig-André Berge 4–0 in the quarterfinals and Rovshan Bayramov in the semifinals, which guaranteed him the silver medal.

[7] Ota participated in the 2019 All-Japan Selection Championship for the 2020 Olympic Games, taking part in the 60 kg Greco-Roman event.

[8] As this rendered him unable to participate in the Olympic Games, Ota opted to take part in the 67 kg Greco-Roman event as well.

[20] Ota faced Kenta Takizawa at Super Rizin 2 on July 30, 2023, winning the fight by a first-round knockout at the end of the round.