DALLAS, (Reuters) – Filipino ring king Manny  Pacquiao said his lightning fast speed will be enough to nullify  Joshua Clottey’s size advantage when the two meet in Dallas on  Saturday.

“My quickness will be the key, my speed,” the seven-time  world champion told Reuters as he prepared for a public workout  in front of a throng of fans.

However, the WBO welterweight champion is not taking his  Ghanaian opponent lightly.

“You cannot underestimate Joshua Clottey,” he said. “He’s a  good fighter, and he’s bigger than me, and I have to be very  focused in the fight.”

Pacquiao’s trainer Freddie Roach acknowledges that former  IBF title holder Clottey, a natural welterweight, has a size  advantage over the champion, who began his career forty pounds  lighter.