Borg won RG-Wimby double three times(78,79,80) when Wimby was played on fast grass(unlike today's slow grass). This particular achievement certainly puts him ahead of Nadal but I'm not sure if it puts him ahead of Federer because Roger would've won on fast grass.
He's still 5 slams short of Federer so one can't conclusively say he's the GOAT.
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