AO? Last time finalist, only losing in a fifth set
RG? Clay GOAT
Wimbledon? 3 time finalist, 2 time champion in the last 6 times he played. Think that counts as having a great shot
USO? Finalist and champion last two times he played.
He can win every single one of them. It all depends how he returns from injury, but if he's at 90% of his former self, he's in with a great shout at the slams.