Well said, general hercules and lady tt.
I don't know if Federer will play to 43, but if anyone can, he can if that's what he wants. As long as he gets the support from his family, stays fit, uninjured, and competitive, and his happy competing he'll keep playing I suppose. Why shouldn't he? He is obviously a fiery competitor and there is no question the fire burns deep inside him. Usually one only gets 1 bite of the apple, and he's had several. But if he decides to stop tomorrow, I, nor any real fan of his would likely begrudge him for it. He's done it all.
Here's one more stat snapshot that shows how well both Andy and Roger played yesterday and the differences between them:

Serve numbers from Andy were amazing as well. Clearly, Federer was the more aggressive with 42 forays to the net. And the key was the breaks.
So Roger said he has one more match to win against Novak tomorrow to make the two weeks perfect. Yes, and sure, it would set records as well, which is nice for the record books.
But really, watching that match yesterday, as a fan of great tennis, with the top players giving their best, was all that I need. It was an amazing match to watch. I almost don't think anything in the final could beat it. Anything else will be gravy on the top.
Respectfully,
masterclass