Canadian boxer Adonis Stevenson is now in an induced coma in hospital after losing the World Boxing Council light heavyweight title to Ukrainian Oleksandr Gvozdyk.
The 41-year-old was knocked out in the 11th round in Quebec City on Saturday night.
Stevenson was put on a stretcher and was taken to the hospital with concussion-like symptoms.
He has since been put in a medically induced coma, his family told the Montreal Gazette. Doctors have said the next 48 hours will be crucial for the boxer.
Stevenson was making his 10th title defense since winning the belt against Chad Dawson in 2013.
It was his first loss since 2010 and the first in Canada.Gvozdyk, 31, was fighting in Canada for the first time.