Undefeated boxer Floyd Mayweather Jr. (L) of the U.S. and UFC lightweight champion Conor McGregor of Ireland face off during a news conference in Las Vegas, Nevada U.S. on August 23, 2017. REUTERS/Las Vegas Sun/Steve Marcus
Floyd Mayweather Jr, left, is an overwhelming favourite to beat Conor McGregor for his 50th career win on Saturday. Steve Marcus / Reuters

McGregor just doesn't have the game to beat Mayweather