Phoenix1983
G.O.A.T.
Perhaps he owns the most Wimbledon titles....oh....wait...
Okay, perhaps he owns the most USO titles...oh...wait...
Okay, perhaps he owns the most AO titles....oh....wait...
Being grammatically correct, you should have said that Federer is not the sole record holder at any of these events.
Because, as you well know, he does indeed own the most titles at all three of the above-named events (albeit the record shared with others).