Kamaru Usman's rivalry with Conor McGregor from hacked messages to "green-panty night"
![Kamaru Usman's rivalry with Conor McGregor from hacked messages to](https://i2-prod.mirror.co.uk/sport/article23982930.ece/ALTERNATES/s615/1_Untitled-1.jpg)
The rivalry between former two-weight world champion McGregor and welterweight champion Usman has heated up again this week, with the Irishman angling for an unprecedented third title fight