Undefeated boxing great Floyd Mayweather Jr will fight mixed martial arts superstar Conor McGregor on 26 August. Both fighters are expected to earn upwards of $100m each but beyond that why are they fighting? Both fighters stand to risk a lot in this one-off bout, so we take a fair look at the ins and outs of the match up



• Mayweather to earn at least $100m from McGregor fight