Re: What will it take for Serena to be considered the Greatest ever?
Talking about the all-time-greatest most people just look at the open-era because all the time before that is difficult to compare to the competition today.
And Navratilova and Graf share (almost) all of the all-time-records: Most GS, most Wimbledon, longest winning streak, longest time at the number 1 spot, most tournaments won, most finals, etc. etc. etc.
There's no doubt about: Serena needs play another deceade to be compared with these two.
But she might do that! :-)