By Mark Vester

WBA welterweight champion Shane Mosley, 38-years-old, doesn't see himself as an older fighter. He thinks the prime of his career is still an unfinished chapter. He wants to prove that on Saturday night when he steps in the ring with Floyd Mayweather Jr. at the MGM Grand in Las Vegas. Mosley wants to prove that his best is yet to come. 

"I don't feel like I'm past my prime. I still feel good. I still feel sharp. For some reason I feel like I'm getting better and better. Mentally, I'm sharper than ever. I understand the sport. I understand the moves. I understand different things. Not only that, but my speed, my power and my movement is still there," Mosley told ESPN.

Mosley is not counting on his power to make the difference. He thinks his speed will present the most problems for Mayweather.

"I think what I'm going to bring to the ring is the speed. The speed that he's not really used to. He's used to being faster than everybody, [but] when you get someone as fast as you and as big as you, and stronger than you - you get a whole different flavor, a whole different style," Mosley said.

Because of the styles, he thinks Mayweather has no choice but to make it a fight. He won't allow Mayweather to run around the ring to pick his shots.

"Boxing fans can expect Mayweather to be in a real fight. Not someone who is a lot shorter than him and a lot smaller than him, where he can just sit there and tattoo the guy all night. He's going to be in there with a real fighter and he's going to really have to fight," Mosley said.

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