Unbeaten Oleksandr Gvozdyk retained his WBC light-heavyweight name in his first fight since departing Adonis Stevenson at a coma.
The Congolese-born French fighter had limped to his corner at the 2300 Arena at South Philadelphia, USA before the referee ended the competition.
Stevenson suffered a “acute traumatic brain injury” in their December bout.
The 41-year-old Canadian had been boxing’s oldest and longest-reigning winner before an 11th-round knockout ended his livelihood.
Stevenson had emergency brain operation and has been understanding how to walk and talk, his fiance Simone’Sisi’ God told the Los Angeles Times at February.
“He is doing this wonderful. I believe he is going to earn a 100% healing – something usually not seen following this kind of traumatic brain injury,” she said.
According to Saturday, Puerto Rico’s Angel Acosta watched Mexican challenger Ganigan Lopez to retain his WBO world Light Flyweight title.
It was the 28-year-old’s next name defence considering taking the belt at 20 17.
Geovana Peres followed in the footsteps of Joseph Parker to eventually become New Zealand’s next WBO world champion as she beat compatriot Lani Daniels from Auckland to choose the vacant light-heavyweight title.
And Argentine Daniela Romina Bermudez defended her WBO bantamweight world title against Irma Garcia of Mexico at Buenos Aires.