Originally Posted by Mustard
Hardcourts wasn't that widespread in Borg's era, and he still won 7 hardcourt titles. Borg also won 6 titles on grass, 42 titles on clay and 46 titles on carpet, so he was clearly excellent across all surfaces.
Borg was the more rounded player, no doubt about that, but Sampras was still better on every surface other than Clay (where he was way worse). But then, if Sampras was that good on Clay, he'd be up there with Federer fighting for the GOAT position, or heck, he'd be the undisputed GOAT.