Demi Lovato sings the National Anthem before a super welterweight boxing match between Floyd Mayweather Jr. and Conor McGregor, Saturday, Aug. 26, 2017 AP

Floyd Mayweather Jr., left, and Conor McGregor pose during a news conference after a super welterweight boxing match Sunday, Aug. 27, 2017 AP

Conor McGregor walks to the ring prior to his super welterweight boxing match against Floyd Mayweather Jr. on August 26, 2017 AFP

Boxing - Floyd Mayweather Jr. vs Conor McGregor - Las Vegas, USA - August 26, 2017 Floyd Mayweather Jr. before the fight Reuters

Floyd Mayweather Jr., left, hits Conor McGregor in a super welterweight boxing match Saturday, Aug. 26, 2017 AP

Floyd Mayweather Jr., left, fights Conor McGregor in a super welterweight boxing match Saturday, Aug. 26, 2017 AP

Floyd Mayweather Jr. lands a hit against Conor McGregor during their boxing match at the at T-Mobile Arena. Mandatory Credit: Mark AP

Boxing - Floyd Mayweather Jr. vs Conor McGregor - Las Vegas, USA - August 26, 2017 Conor McGregor in action with Floyd Mayweather Jr. Reuters

Boxing - Floyd Mayweather Jr. vs Conor McGregor - Las Vegas, USA - August 26, 2017 Conor McGregor in action with Floyd Mayweather Jr. Reuters

Floyd Mayweather Jr. celebrates after defeating Conor McGregor in a super welterweight boxing match Saturday, Aug. 26, 2017 AP

Floyd Mayweather Jr. celebrates with the WBC Money Belt after his TKO of Conor McGregor in their super welterweight boxing match on August 26, 2017 AFP

Floyd Mayweather Jr. vs Conor McGregor - Las Vegas, USA - August 26, 2017 Floyd Mayweather Jr. celebrates with Floyd Mayweather Sr. after winning the fight Reuters

: A general view before the Floyd Mayweather Jr. and Conor McGregor super welterweight boxing match on August 26, 2017 at T-Mobile Arena in Las Vegas, Nevada AFP