Amongst his successes was his participation in the 8th World University Wrestling Championship in Greece where he won gold in the 60 kg division.
He also won the All-Japan Freestyle Wrestling Championship 60 kg division in 2007, which gave him his entry into Sengoku.
Mann dominated the fight and claimed a unanimous decision victory, handing Osawa his first professional loss.
In the third round, the bout was ended after accidental kicks to the groin by Toida and ruled a "no contest".
[7] Since his last fight with Sengoku, Osawa has competed in Pancrase, ZST, RINGS, Shooto, and Grachan.