I have such weird feelings about this thing in general. It's going to be an awful fight unless Mayweather either carries him or McGregor gets ridiculously lucky. If it somehow goes long (unlikely), it only gets worse for McGregor whose gas tank has been questionable at best.
This is why boxing and MMA are both a mess right now. Boxing has improved in recent years, but it still suffers from a narrow appeal, fighters not knowing how to sell fights, and important fights sometimes taking years and years to materialize. On the upside, guys get paid.
For MMA, since the UFC was sold, it's become a gridlocked disaster that's wasted talent by focusing on nonsense fights and selling fighters like Connor McGregor, Michael Bisping, and Jon Jones because they're marketable, and not for any other reason. I mean, Bisping, a healthy champion, just watched ringside while two guys that would finish him within two rounds fought for his interim title. So because of this, guys like Jacare, Romero, Maia, and THE ENTIRE 125LB DIVISION have been basically screwed. Meanwhile, fighters continue to not get paid, typically have little to no medical, have little to no endorsement opportunities of their own, and are essentially property of the UFC brand. The quality of the fights suffer tremendously, unless someone is a completely casual fan only buying the drama.