My guess is 1.3M as reported by ESPN or any other major company. Rick Glaser will probably have about 750k - 1M. JCC Jr fight hit well over 1M already. I think basically all of Canelo's Mexican fans (1M) from there would've tuned in to see him in vs a greater threat, plus the hardcores (150k) plus GGG fans (150k).
But Canelo-JCC Jr did. This is a better fight, I think it might crack 1M, maybe Mayweather-McG even helped a little by bringing boxing into the spotlight.
Floyd needed a dance partner for his biggest numbers. Without Pac, Canelo, ODLH, Cotto, Mosley and McGregor (lol), his numbers were pretty dismal (Maidana 2X, Guerrero, Ortiz, and Berto).
The Ortiz fight, at the time, was one of the most expensive PPVs. It made more than the Mosley fight. Guerrero and Maidana fights all did over 800k. (Maidana II did as much as Alvarez-Cotto) Yes, Floyd needs a dance partner but his numbers always surpass other fighters.
Does the UFC add global ppv buys to their total? I see the UFC record is 1.7 mill so anything better than that will be good, boxing will be back to a side status in the US. Boxing needs a thriving US market, it's good for the sport. If UFC adds global buys 1.3-1.5 might beat the record?