By Miguel Rivera and Rene Umanzor

When Juan Manuel Marquez moved up to the welterweight division in 2009 to challenge Floyd Mayweather Jr., he claims that he didn't train properly and put on the "wrong kind of weight" and it made him slow, sluggish and the power wasn't there. He weighed in at 142-pounds, but his body and power wasn't as impressive as it appeared for his last two stints at 147.

Prior to last year's third meeting with Manny Pacquiao, Marquez started working with conditioning coach Angel "Memo" Heredia. Marquez, also coming in at 142 for that match, looked stronger and handled the weight a lot better. For the fourth meeting with Pacquiao, on December 8th, he looked to be in even better shape with a ripped and muscular 143-pound body. He used that power to knock Pacquiao down in the third and scored a sensational one-punch knockout in the sixth round.

With Memo by his side, he says the Mayweather fight would have been very different.

"Things would have been very different. I wasn't doing the right things [in training]. [Memo] has helped me a lot and I'm doing a lot of different things that I was never doing before. We worked very, very hard. I think so, yes, things would have been very different," Marquez said.