Argentine boxer Hugo Santillan has died aged 23 after injuries sustained in the ring.
The news comes just days after Russian boxer Maxim Dadashev died aged 28 after a fight.
The WBC tweeted: "RIP Hugo Santillan. He passed away from injuries suffered during Saturday's fight which ended in a draw. We join Hugo's family and friends in grief, support and wish prompt resignation."
Santillan had fought Eduardo Abreu to a draw in a super-lightweight bout in Argentina.