US boxer Day 'extremely critical' after devastating knockout

American boxer Patrick Day was fighting for his life in critical condition in hospital on Sunday night after lapsing into a coma following a vicious knockout by Charles Conwell the night before.

The 27-year-old Day suffered a "traumatic injury" and underwent emergency brain surgery Saturday night after being knocked out by Conwell in a super welterweight bout on the card at Chicago's Winstrust Arena.

"Patrick is in a coma caused by the injury and is in extremely critical condition," said fight promoter Lou DiBella.

"We appreciate the outpouring of support, prayers and offers of assistance from all corners of the boxing community."
"Life doesn't seem fair sometimes. Please keep Pat in your prayers, thoughts and hearts."