Heavyweight boxer Otto Wallin -- the man who busted up Tyson Fury's face last year -- says he's very confident he's got coronavirus ... and he's been quarantined for the past week.
The 29-year-old former champ says his mother recently visited him in NYC -- and when she returned home to Sweden, she started feeling ill. Mom's boyfriend also began feeling sick and got tested -- and doctors confirmed he has COVID-19.
Now, Wallin not only believes he was exposed to the virus ... but he's convinced he's been infected.