Mayweather vs. McGregor, the promotional tour

Conor McGregor hcuckles while listening to Floyd Mayweather Jr. at their promitional stop in London on Friday.

Conor McGregor, right, goes on the verbal offensive with Floyd Mayweather Jr. on Friday at SSE Arena in London.

Floyd Mayweather Jr. stalks the stage as money rains down around a seated Conor McGregor on Friday in Brooklyn.

Floyd Mayweather Jr., arrives at a news conference at Barclays Center on Thursday wrapped in the Irish flag, something that preturbed Conor McGregor (not pictured).

Conor McGregor, right, rips an Irish flag off Floyd Mayweather Jr. during their promotional stop in Toronto on Wednesday.

Floyd Mayweather Jr., left, and Conor McGregor stand their ground, nose to nose, during the promotional stop at Barclays Center in Brooklyn, N.Y.

Floyd Mayweather, left, and Conor McGregor exchange harsh words during a promotional stop in Toronto on Wednesday.

Floyd Mayweather Jr. and Conor McGregor face off in Toronto during their promotional stop on Wednesday.

Floyd Mayweather Jr. and Conor McGregor take the steage at Staples Center on Tuesday to open their four-city international press tour.

UFC champion Conor McGregor takes the stage during his promotional tour with unretired boxing champion Floyd Mayweather Jr. at their stop in Los Angeles on Tuesday.

Floyd Mayweather Sr. defends his son Floyd Mayweather Jr. while getting into a shouting match with Conor McGregor (not pictured) during a promotional stop at Staples Center on Tuesday.

Floyd Mayweather Jr., left, and Conor McGregor have to be separated by UFC president Dana White after standing toe to toe at a promotional stop at Staples Center on Tuesday.