Charles Conwell has written a heartfelt letter to Patrick Day, the 27-year-old American boxer who is in a coma because of injuries suffered during a recent fight .

An unbeaten 21-year-old with 11 wins (and eight knockouts), Conwell fought Day in a super welterweight bout in Chicago's Wintrust Arena on Saturday.

Conwell dropped Day with hard right hands in the fourth and eight rounds, before knocking him down again, this time for good, in the 10th.

Day received oxygen treatment in the ring, left the arena on a stretcher, and was taken to hospital in an ambulance. He had seizures before arriving, had emergency brain surgery, but remains in a coma. His trainer Joe Higgins recently said Day "is fighting for his life," according to USA Today .

The situation is haunting Conwell, who said if he could take it all back he would, and that the incident made him consider quitting boxing forever.

However, he wants to use Day as motivation to win a world title in his name.

"This is my last time speaking on the situation because of this being a sensitive topic," Conwell said on Twitter . "Not only for his family and friends, but for myself and the sport of boxing."

Here's Conwell's letter in full:

Dear Patrick Day,

I never meant for this to happen to you. All I ever wanted to do, was win. If I could take it all back, I would.

No one deserves for this to happen to them. I replay the fight over and over in my head thinking what if this never happened, and why did it happen to you. I can't stop thinking about it myself. I prayed for you so many times and shedded so many tears because I couldn't even imagine how my family and friends would feel. I see you everywhere I go and all I hear is wonderful things about you.

I thought about quitting boxing but I know that's not what you would want. I know that you were a fighter at heart so I decided not to, but to fight and win a world title because that's what you wanted and that's what I want. So I'll use you as motivation every day and make sure I always leave it all in the ring every time.

With compassion, Charles Conwell.

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