He is the universally recognized Welterweight Champion but he has not fought a Welterweight since he won the title. By the time he fights DLH again. It will be nearly 2 years without a mandatory defense.

BTW this is not a nock on Mayweather, I'm just curious if this is something that will happen soon. Also we could see some interesting developements since Andre Berto is currently WBC's #1 contender and that ain't likely to change for a while.