'82 - '91:best decade in tennis
Why weren't there any hard hitting Del Potro's or Cilic's from 2004-2008? 34 year old Agassi took peak Federer to 5 sets at U.S Open but any problem cannot be found? GOAT argument. 20 year old Djokovic straight setted prime Federer at Aussie Open but any problem cannot be found? GOAT argument.
How do we define the "worst" player is as relative as how we define the "best" player. Surely, there are unranked players that are worse than any player anyone could ever imagine though, so this question has NO answer. Should this thread be taken seriously? No. Should people take these things more lightly and stop classifying them as "forum disruption"? Yes.