Floyd Mayweather features in four of the five highest-selling boxing PPVs, led by Mayweather vs Manny Pacquiao with 4.6 million buys, followed by Mayweather vs Conor McGregor (4.3M), Oscar De La Hoya vs Mayweather (2.4M), Mayweather vs Canelo Alvarez (2.2M) and Evander Holyfield vs Mike Tyson II (1.9M). Which fight could ever break the 4.6M record?