despite the large amount of hype that surrounded it, critics felt that the bout itself was disappointing, primarily citing mayweather's defense-oriented strategy in the ring and pacquiao's difficulty in landing punches on mayweather. this had led to some critics re-labelling the fight 'better never than late' rather than 'fight of the century'. it was later revealed following the event that pacquiao had sustained an undisclosed injury to his right shoulder while training and that while it had healed in time for the fight, he re-injured it during the fourth round. further controversy emerged when it was revealed that prior to the fight, mayweather had been administered iv fluids cleared by the united states anti-doping agency (usada) through a retroactive "therapeutic use exemption"—an exemption, however, not authorized by the nevada state athletic commission (nsac).