Mairis Briedis dressed up as 'Super Mario' in response to being misnamed by YouTube star Jake Paul.
The Latvian star has frequently called out Paul for a boxing fight and even had a tattoo inked before releasing a 'diss track' in order to try and push a potential meeting.
Briedis was ringside for cruiserweight rival Lawrence Okolie's successful defence of his WBO cruiserweight belt at The O2 arena in London.