So, this is later than I thought it would be. Through a combination of happenstance and procrastination, I failed to run fully updated rankings before Indian Wells started - and I would have put them up after the tournament began, except that the draw promised extensive madness and then delivered in spades, and it seemed like a good idea to let that play out.
Everyone knows the big story: Roger Federer sat out the last six months of 2016, then came back to start this year and has won the two biggest events played to date. Which is marvelous theater, of course, but it's accompanied by so many other things that I'm reluctant to discuss them in too much detail before we get to the numbers. So let's do that.