Mark Tibbs, the head trainer of former two-division world champion Billy Joe Saunders, says the boxer had no vision in his damaged right eye on Saturday night - prompting him to quickly stop the fight with Saul 'Canelo' Alvarez.

Before a crowd of over 73,000 fans at AT&T Stadium in Arlington, Canelo stopped Saunders in eight rounds to unify the WBC, WBO, WBA super middleweight titles.

During the eight round, Canelo clipped Saunders with hard uppercut directly on the right eye. The hard punch created immediate damage, with the eye rapidly swelling up and Saunders trying to survive the round.

When Saunders came back to the corner, he indicated to Tibbs that his vision was impaired in the right eye.

Tibbs explained that he didn't like Saunders' condition and says the boxer allowed him to make the final decision regarding the contest being stopped or moving forward. The veteran coach decided to call it day before the start of the ninth. 

"His eye socket was caved in and he couldn't see. I didn't get the response I wanted from him. I didn't get the response I needed in the corner and I knew it was caved in. I'm not surprised I got the response I got," Tibbs said.

"I had to pull it… He never said, 'No, that's it.' He left it to me. He took it well. He was in pain."

It was revealed later that Saunders suffered several fractures on the orbital bone of his right eye. He underwent surgery in Dallas. The recovery process is expected to take a long time, according to promoter Eddie Hearn.