Quintana used movement and well timed counters to keep Williams off him and with this he lowered Williams workrate big time which then lead to a clear UD win.

Now i know he beat Quintana in the rematch but 1 minute of a round to me doesn't prove that he can handle slick moving counter punchers.

Mayweather is a slick moving counter puncher who is slicker, quicker, more accurate and smarter than Quintana. He would hit Williams whenever he wanted to and with is defense would frustrate Williams.

Mayweather wins a clear decision.

This is a bad matchup for Williams not the other way round.