Juan Manuel Marquez dropped him Manny Pacquiao with huge right hands and got the win. After the second right hand, Pacquiao was flat on his face, out cold from a brutal straight counter right at 2:59 of the sixth round.
ESPN has the full fight video highlights above.
Pacquiao outlanded Marquez 94/52 and won all but the third and final rounds. He scored a 10-8 round in the fifth when he dropped Marquez. Pacquiao's head movement seemed to confuse Marquez and allowed him to land a lot of left hands to the head. He recovered from being dropped in the third round to dominate the fourth, fifth and most of the sixth round. In fact, when the end came, Pacquiao was pressing forward, looking to finish a cornered Marquez when he ate the counter.