Karimachiani would have faced an Israeli in the next round, and deliberately lost the match.
The former grand champion admitted assaulting a junior wrestler, in a case which rocked the sport.
As a sumo grand champion retires in disgrace, is the disciplined sport of emperors dying in Japan?
Iranian Alireza Karmi-Machiani is suspected to have thrown the bout to avoid fighting an Israeli in the next round.
Audio & Video
Get Inspired Activity Finder
Run by the BBC and partners
Find ways to get active near you:
For more ideas, information and inspiration, visit bbc.co.uk/getinspired