American Roy Sims got silver in both divisions , winning 11 matches , and losing ONLY to Byamba .
At the 2016 US Sumo Open , Byambajav Ulambayar was undefeated , going 13 - 0 to win gold in heavyweight and openweight .
American Roy Sims got silver in both divisions , winning 11 matches , and losing ONLY to Byambajav Ulambayar .
At the 2016 US Sumo Open , Byambajav Ulambayar was undefeated , going 13 - 0 to win gold in heavyweight and openweight .