I've also talked about when the "Big Four" became a thing, but I think that El Dude's chart does tell us something. He's stretching it across when Roger started dominating to today...to encompass all of the years that include dominance by Federer, Nadal, Djokovic and Murray. The graph is impressive, and not without merit to show us, in all that green, how much they have hogged up all of the big titles, from beginning to...well, whenever the end is. If you start at 2008, I suppose that's one way to look at it, but there was essentially no Murray or Djokovic last year...therefore, was there a Big 4 last year? No. So do you stop? I'm sure there are myriad ways to show it, but I don't mind the starting in 2004. It's worth remembering that they're not actually The Beatles. They are individual players, and their dominance is not a rigid thing, in terms of years.