Stevenson lost his WBC light heavyweight title to Ukraine's Oleksandr Gvozdyk when the fight was stopped during the 11th round.
Stevenson, 41, boxing's oldest and longest-reigning champion, suffered an 11th-round knockout on Saturday, slumping after a flurry of punches. The 31-year-old Gvozdyk is now 16-0.
Oleksandr Gvosdyk (left) punches Adonis Stevenson during their WBC light heavyweight championship fight at the Videotron Centre on Saturday, Dec. 1, 2018, in Quebec City.
The Ukrainian landed several solid blows at the beginning of the round, which left Stevenson faltering in the corner. "His family, his (fiancée) Simone and Groupe Yvon Michel would like to thank the many people who have taken the time to send comforting messages. He was very confused when he arrived, we suspect a concussion", Gvozdyk told a press conference on Saturday night. They wish to inform friends and supporters that Adonis is now in critical condition in intensive care following his fight against Oleksandr Gvozdyk.
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"Right now, we're all just hoping for the best but not in a position to say anymore on his condition", said Michel.
Stevenson controlled the center of the ring for part of the match, but in the 10th round Gvozdyk finished with a series of blows that seemed to motivate him for the 11th round.
Stevenson was leading on two of the three judges' scorecards and was even on the third after the 10th.
Gvozdyk appeared to be in control for much of the fight - including scoring a third-round knockdown that referee Michael Griffin simply missed and ruled a slip. During the 11thround, Gvozdyk clobbered Stevenson with a right hand, before delivering a vicious combination to knock him out.