Watch: Mayweather blasts ESPN reporter over Pacquiao, admits Berto is a B minus fighter

Osuna mentioned the shoulder injury Pacquiao cited when referencing the fight, which prompted Mayweather to launch a tirade of expletives and ask questions of his own on more than one occasion.

The pound for pound king wanted Osuna to admit that he didn’t think Pacquiao was suffering from a bad shoulder in the fight – which Osuna eventually did under pressure.

Mayweather later admitted when pushed himself by Osuna that upcoming opponent Andre Berto was more a B minus fighter than an A fighter like Pacquiao, Miguel Cotto and Canelo.

Watch the video provided by ESPN

Mayweather v Berto is live on Showtime PPV. You can order Mayweather v Berto in the UK by clicking BoxNation