Personally I rank Borg as the GOAT.
11 Grand Slams but he only entered the Aus Open once which was played on grass at the time (i.e. One of his better surfaces). That's impressive when you realise he effectively retired at the age of 24/25 (actually retired at 26 in 1983 but only played 1 tournament in 1982).
His Grand Slam singles record is 14116. Nadals is 13118 for the record but he's entered 1 more slam (124-18 over the same number of slams)
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Crucifying my Oracle average one match at a time