Maybe – according to an opinion piece on Tennis Week.
It doesn’t really matter how many total slams Nadal ends up winning, 10, 12, 16, whatever, he is totally dominating tennis right now on all three surfaces, which has never been done before. Even when Federer was on top, we could see the clues that Nadal was a problem for him. But with Nadal on top, there is no potential successor on the horizon who anyone cay say with any degree of certainty will eventually overthrow Nadal. Andy Murray and Novak Djokovic were prime contenders not long ago but look like they could end up as second bananas for years to come.
Rafael Nadal, the greatest tennis player in the history of the sport? Sounds a bit of a reach, but in a few years, at the rate Nadal is going and improving, at the rate he keeps annihilating the field, it might be the undisputed truth.
I still say trying to declare someone “the greatest ever” is futile – too many variables.