Mike Tyson cautions Floyd Mayweather about potential health risks ahead of their historic exhibition, while Mayweather vows a legendary performance for fans globally.

Mike Tyson and Floyd Mayweather Jr. are two of boxing's all-time greats, from different eras (and weight classes). The two old-timers will fight next year in an exhibition match.

The 59-year-old will be making yet another stunning return to the ring next year - but fans have been left concerned due to the boxer's ongoing health struggles