It's no secret that 'Dal and Djok' extend their grunts during key pressure moments, even delay their grunts so they reach right when the ball reaches the opponent's side
I did a thread showing multiple instances of this, but it got deleted
This is a good picture of the genetic history of Europe (although there are some guesstimations in how each peoples looked, it is close enough with the genetic reconstructions that we've accomplished within the last decade)
The "basal" groups are WHG (western hunter gatherer), ENF (early...
There's not really a point in comparing them; completely different circumstances. Sure Borg won 5 in a much shorter time, but he also quit after he lost to his biggest rival at a young age
There was also a bunch of grass courters then, but Djokovic beat Fedal multiple times on the surface