As long as you are aware that this weekend's fight between Floyd Mayweather and Conor McGregor is a cynical, uncompetitive cash grab, it should actually be quite fun.
Mayweather, the best boxer on Earth, is going to absolutely belt McGregor, the biggest star in mixed martial arts. It's not worth discussing any other possibility.
The reason for this is so bleedingly obvious it hardly bears pointing out (but I'm going to do it anyway, sorry).
They are having a boxing match, so the boxer will win.
Full fight can be watched here, at least for now. It isn't great quality but it is watchable.