In those previous eras you mention there always seemed to be an interesting 2nd tier that could win big tournaments. This created depth and interest outside the usual suspects. People like Edberg and Lendl or Roddick. Kournikova, whose aesthetic charms often took precedent over her athletic presence, could be counted on to play a strong match and create interest.  All had personality and presence of one form or another - though that is not to say they were necessarily likeable. While I wish guys like Raonic well, he is as wooden as they get. Bouchard had her "army" but her moment is most likely past. It takes time to build great rivalries like we see today or of the Connors-McEnroe-Borg days and Kelly is right that, once the sun sets on today's stars, we have a long wait before us to find their like again.