UFC 263 is loaded with Israel Adesanya and Deiveson Figueiredo defending their straps. Also, Nate Diaz didn't exactly ease into his return against a heavily-favored Leon...
At 50-0, Floyd "Money" Mayweather has been untouchable his entire illustrious career. So what happens if he gets caught by a wild-swinging, nothing-to-lose YouTuber?