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(L-R) Floyd Mayweather Jr. and Conor McGregor trade punches during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

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

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

(L-R) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(L-R) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

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

Conor McGregor sticks his tongue out at Floyd Mayweather Jr. in a super welterweight boxing match Saturday, Aug. 26, 2017, in Las Vegas.

Conor McGregor sits in his corner between rounds in a super welterweight boxing match against Floyd Mayweather Jr., Saturday, Aug. 26, 2017, in Las Vegas.

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

Actress Charlize Theron attends the super welterweight boxing match between Floyd Mayweather Jr. and Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

Former boxer Mike Tyson attends the super welterweight boxing match between Floyd Mayweather Jr. and Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

Singer Demi Lovato performs the national anthem prior to the super welterweight boxing match between Floyd Mayweather Jr. and Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

Conor McGregor stands in the ring prior to his super welterweight boxing match against Floyd Mayweather Jr. on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

NBA player Lebron James and wife Savannah Brinson attends the super welterweight boxing match between Floyd Mayweather Jr. and Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

Actress Jennifer Lopez and former MLB player Alex Rodriguez attend the super welterweight boxing match between Floyd Mayweather Jr. and Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(L-R) Floyd Mayweather Jr. sits in his corner in between rounds of his super welterweight boxing match against Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Floyd Mayweather Jr. walks to his corner after a round in his super welterweight boxing match against Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(L-R) Conor McGregor leans on Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(L-R) Floyd Mayweather Jr. and Conor McGregor tie up during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Floyd Mayweather Jr. throws a punch at Conor McGregor during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

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

Conor McGregor after losing to Floyd Mayweather Jr. in a super welterweight boxing match Saturday, Aug. 26, 2017, in Las Vegas.

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

(L-R) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(L-R) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Conor McGregor throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

(R-L) Floyd Mayweather Jr. throws a punch at Conor McGregor during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

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

Conor McGregor, right, throws a punch at Floyd Mayweather Jr. during their super welterweight boxing match on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

Conor McGregor stands in the ring prior to his super welterweight boxing match against Floyd Mayweather Jr. on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.

Floyd Mayweather Jr. walks to his corner after a round in his super welterweight boxing match against Conor McGregor on Aug. 26, 2017 at T-Mobile Arena in Las Vegas, Nevada.