After 12 rounds of boxing, Mayweather defeated Pacquiao by only 4 points. Pacquiao was very aggressive during the bout but was unlucky to have lost by 4 mere points.
Mayweather danced a lot around the ring, threw punches and jabs here and there that counted, Pacquiao kept running around, chasing him but didn't land as many punches as Mayweather.
Mayweather still remains the undefeated champion. The AP reports that Manny Pacquiao suffered a right shoulder injury during training but was denied the use of an anti-inflammatory in the dressing room.
Before a fight, there's a box that needs to be checked if a boxer has a pre-existing injuyry but he didn't check that box when he had that paperwork filed.