By Rick Reeno

Las Vegas, Nevada - WBC/WBA welterweight and junior middleweight champion Floyd Mayweather Jr. (47-0, 26KOs) believes Manny Pacquiao was surprised by the size difference when they faced off a few weeks ago at the Los Angeles press conference to officially announce their mega-fight on May 2nd at the MGM Grand in Las Vegas.

According to Mayweather, he was advised by a source that Pacquiao wears lifts in his shoes to give him a few additional inches in height. Mayweather, listed at 5'8 has a 2 1/2-inch height advantage - although it appeared to be more when they faced off.

"He wears the lifts in the shoes," Mayweather said. "I know all the little secrets he does. He wears the little lifts in his shoes so he can be a little taller, but he's entitled to do what he wants to do."

"I don't think he expected me to be so tall or big, even though I walk around at 147 I'm still a big welterweight - where you have other guys who come from 168, 170 and [squeeze] all the way down to 147. I walk around at 150, 152. My weight fluctuates between 147 to 151."