[1] Sawatani's martial art experience started with full contact karate, after competing in numerous junior tournaments he switched to amateur kickboxing which led him to participate to the 2016 Japan Cup as a Shin Karate representant.
He won the tournament and the event MVP award which earned him an opportunity to turn professional with the RISE organization.
[5] On August 5, 2018, Sawatani was selected to participate to the 2018 RISE Rookies Cup in the featherweight division.
He defeated Silencer Higuchi by unanimous decision in a fight serving as the semifinal bout.
In the final he rematched YA-MAN and defeated him by unanimous decision to win the Cup.
[11] The final of the tournament happened on July 4, 2021, at DEEP KICK 54 where Sawatani defeated Taisei Iwagoe by split decision to capture the vacant title.
[19] He won the fight by unanimous decision, after an extra fourth round was contested.