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But seriously, though, while I agree that the gap between the Big Three and Murray is large enough to make Murray not warrant being truly part of that group--at least in terms of tennis greatness--over the course of his prime, the gap between him and everyone else was also quite large. Each year there was someone close, but he was overall the fourth best player during that time and--taking that period as a whole--no one was particularly close.
I'll put a bit of elbow grease into it. Let's look at 2008-17, which is the ten-year span that Andy finished in the top 10. I looked at the top players of that time and came up with an average ATP point value for each, over those ten years:
1. Novak Djokovic 10,097
2. Rafael Nadal 8,369
3. Roger Federer 7,742
4. Andy Murray 6,600
5. David Ferrer 3,596
6. Tomas Berdych 3,376
7. Stan Wawrinka 3,305
8. Jo-Wilfried Tsonga 2,841
9. Juan Martin del Potro 2,511
10. Marin Cilic 2,492
What stands out to me is the huge gap between Murray and the rest.
Now of course the time-span benefits Murray, as those are his prime years, but I think that's the point: for a decade, he was the clear #4 in the sport, and closer to #2-3 than he was to #5, as far as ATP points are concerned (and as a representation of overall performance).
So if we want a "Big Four Era," we can say it is 2008-17, perhaps peaking in 2012 when they all won a Slam.
Truly the Worst of the Best, and the Best of the Rest at the same time.