General Messages
12+ has been done 14 times in the Open Era, including 12 times by a member of the Big Three (Federer 6, Nadal 4, Djokovic 2).
I think Federer’s 16 SFs at the Tour Finals, one of the strongest tournaments, is an underrated record.
So far only Federer has 15+ SFs at a single event, which he did...