Career
Background
Osawa is a successful wrestler. Sengoku
In May 2009, Osawa made his Sengoku debut at Sengoku 8 against Kota Ishibashi. Three months later, Osawa returned at Sengoku 9 against Toru Harai.
Late in the first round, Osawa defeated Harai via TKO (punches).
After defeating Ki Hyun Kim at Sengoku 10, Osawa faced Ronnie Mann at Sengoku 11. Mann dominated the fight and claimed a unanimous decision victory, handing Osawa his first professional loss.
At Sengoku 12, Osawa returned to face Kyung Ho Kang. In June 2010, Osawa faced Katsuya Toida at Sengoku 13.
In the third round, the bout was ended after accidental kicks to the groin by Toida and ruled a "no contest"
Since his last fight with Sengoku, Osawa has competed in Pancrase, ZST, RINGS, Shooto, and Grachan.