By Francisco Guzman

According to Freddie Roach, trainer of Manny Pacquiao (54-4-2, 38KOs), his boxer is in desperate need of a knockout on December 8th at the MGM Grand in Las Vegas. Pacquiao will face WBO junior welterweight champion Juan Manuel Marquez (54-6-1, 39KOs) for a fourth time. HBO pay-per-view will carry the event.

After three close and controversial endings, both boxers are going to pursue a knockout ending. Roach likes what he hears, because an aggressive fight will create more opportunities for Pacquiao to get a knockout.

"[Marquez] will be more hittable and not so much a counter-puncher. I think we need a knockout to secure his number one spot in the world. He needs to be impressive and a knockout would be impressive," Roach said.

"In the first one [Pacquiao] was aggressive in the beginning of that fight. In the second fight we had one knockdown and in the third fight we had none. He just lost that killer instinct. In the first fight he was trying to knock him out, but Marquez is very resilient also. You have to take that factor in also. We need to bring back that killer instinct where he finishes guys like he used to."

Despite the complaints by Marquez of being robbed in all three fights, Roach felt Pacquiao did enough to win all three of them.

"[Marquez] lost those fights and I still had Manny winning by a little bit. Manny started well and he finished well," Roach said.

However, Roach also said - "A lot of fans thought that we lost [the third] fight so we have to redeem ourselves."