Mayweather is his most vulnerable now. Im not saying he is washed up or an old fighter cause he is not. But since around the time he left Lightweight he has fought a lot differently. Of course he has made adjustments because of the weight and lost some speed, but there are other things I have noticed. He backs himself to the ropes more and more every fight. He gets away with it because he is that talented and elusive, but Its not something he used to do. Another thing he does less of is throw combinations. In the Hatton and Oscar fights he was throwing only one or two punches at a time for most of the rounds. At lightweight he put his punches toghether. Dont get me wrong, he is one of the best in the world, but at Light Welterweight and Welterweight he looks very different. Hatton couldnt beat Mayweather cause he didnt have the tools to do it. Oscar may have but those tools were too rusty and worn out. Williams has the right things to beat him as does Forrest (possibly) and Cotto might also. I think it will be a rangier fighter that will give him his first loss though.