Odds are courtesy of OddsShark. It's a big test for Mayweather despite the fact the rules have been tailored to favour him.
Unlike the McGregor clash, which did count towards his professional record, the Tenshin bout will not affect his perfect tally.
Express Sport has all the details on how to watch the Mayweather vs Tenshin fight today. Mayweather and Tenshin are likely to perform their ring walks at 10am UK time on Monday morning, but it could be sooner or later depending on the undercard fights.
Unfortunately, the fight will not be aired on TV in the UK.
The stage is set at Saitama Super Arena in Japan. The undercard is expected to get underway at around 6am UK time.
Mayweather vs Tenshin live stream: Who will triumph in the bizarre bout? Mayweather enjoyed a glittering year career, starting in , before retiring with a perfect record in He added a 50th victory to his professional record following a glamorous showdown with UFC star Conor McGregor in Japanese MMA promoter Rizin made a stellar offer to Mayweather for this exhibition bout with Nsukawa, with money the deciding factor in the show going ahead.
Mayweather appeared to pull out of the fight in November due to a misunderstanding over the size of the event, but issues were ironed out and the fight will happen.
The fight gets underway around 10am UK time and there are lingering concerns Mayweather will not show. But Nasukawa is confident the fight will take place.
And I have no problem mentally.