I posted my prediction in the official thread but I'll re-post it here.
Connor comes out strong in rounds 1 & 2 while Mayweather retreats and tries to find his distance. Rounds 3 & 4, Mayweather finds his rhythm within these rounds and starts landing 2 & 3 punch combinations with a stinging lead right hand. Rounds 4 through 6, Mayweather continues to out box Connor and has him completely figured and starts landing at will. Round 7, Mayweather is really confident and completely punishes Connor in this round and shows why an amateur boxer should never fight someone of his caliber. Round 8, Connor's left eye has swollen shut and his corner realizes how much of a mis-match this is and has to pull Connor out of the fight before this round even begins. TKO Victory for Mayweather.
I hate Mayweather but this is just a spectacle and it won't even be close. I'll be pulling for McGregor to land that power shot in the first 2 rounds.
Fight Stats: Mayweather : McGregor
Jabs/Land/%: 132/71/54% : 98/15/16%
Power/Land/%: 228/151/68% : 112/13/12%
Total/Land/% 360/222/61% : 210/28/14%