GOAT debate is futile when you see only 1 metric, i.e. Grand Slams won. It's important, no doubt. But all court adaptability is a different animal. Shows true versatility and when it sustains for over 19 years of career, its a ridiculous stat. Check the magical 54% number here:
www.atptour.com
For all fans of Nadal and Federer - ofcourse they are great players and have their own claim to GOATness, no denying that. But let's appreciate the class of Djokovic. It's sustained brilliance lasting over a decade now ( apart from 2017). He has been a force, a competitor who is always there to face the other big 2. No matter the court type, conditions, draws, slams or masters. Truly a champion!

All-Surface Novak: Learn Why Djokovic Is In A Class Of His Own | ATP Tour | Tennis
Novak Djokovic is historically efficient on grass, clay and hard courts. An Infosys ATP Beyond The Numbers analysis shows why as the Serbian gets set to pursue his seventh Wimbledon title.
For all fans of Nadal and Federer - ofcourse they are great players and have their own claim to GOATness, no denying that. But let's appreciate the class of Djokovic. It's sustained brilliance lasting over a decade now ( apart from 2017). He has been a force, a competitor who is always there to face the other big 2. No matter the court type, conditions, draws, slams or masters. Truly a champion!