By Jhonny Gonzalez

Lightweight champion Juan Manuel Marquez will do everything possible to avoid the mistakes which led to a dominating decision loss to Floyd Mayweather Jr. in 2009. Marquez moved up by two divisions to face Mayweather at 147-pounds. On November 12 he climbs back up, by nearly two divisions, to a catch-weight of 144-pounds to face WBO welterweight champion Manny Pacquiao.

Marquez plans to work with a specialty group of medical physicians to shape his body and to assist him with a proper gain in weight, so the boxer retains his speed and gains power from the added muscle. Marquez blamed the "gained weight" for his loss to Mayweather. He felt weaker and lost much of his speed. He won't make the same mistake against Pacquiao.

"The fight with Mayweather was a [learning] experience for me. This time I'll go up [in weight] and I'll be very strong, fast, and this time I shouldn't notice the difference. I'm going to see specialized doctors to work on that," Marquez told Sal Rodriguez.

Marquez returns on July 16 in Mexico in a ten round bout against Likar Ramos.