Do you include the Davis Cup in that? I haven't included them in my spreadsheet sorry
Yes, I include all official ATP matches, and DC are a part of them. So Isner is listed as having 41-18 here:
I didn't realize at first you didn't, thought you forgot Isner's last tournament (three TBs) and just had an error for Fognini.
Makes one's life much easier to include them, since official ATP stats will agree with yours except in case of errors. But if you want to make one without, then there's nothing wrong with that.