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Big Cat
If Novak Djokovic ties Federer and Nadal in Grand Slams, he is the GOAT
Once he equalizes with Federer and Nadal, I think at that point it's like, yeah, Djokovic is GOAT. And head-to-head he's dominated both of them, right?
Djokovic eventually surpassed both (reaching 24 titles) and is now widely considered the GOAT by statistical standards.