Re: GOAT on EuroSport..
The problem is he is inconsistent. He has Rosewall getting pummeled by a 'bigger' player like Borg (when they actually overlapped somewhat), and then amusingly Laver edges Lendl on hardcourts. Come on!
Lendl ushered in the modern power game, and was definitely more powerful than Borg. Maybe not physically, but his game at the end definitely was played at a different pace b/c of the new tech and the fitness regimes.
You can't simultaneously give Laver the benefit of new training regimens, grip changes, racquet technology and so forth and not Rosewall, much less invoke physical disparities between players and then ignore it in the opposite case (Lendl is much bigger and stronger than Laver ever was)