Re: Is there really a Big 3/4 or is it just the Big 2?
Well, people have talked about "the big four" in the men's game for quite a long time now, but there's rarely (never) been a period in which Roger/Rafa/Novak/Andy were equally matched.
Even though I agree there is a gap between Serena, Vika and Masha, I'd still say that anyone else winning a slam outside of those three would be a surprise at present, and in that sense I think talking about a "big three" is reasonable.
Jarmila Wolfe|Svetlana Kuznetsova|Francesca Schiavone|Zhang Shuai|Sloane Stephens|Ashleigh Barty
Andy Murray|Stanislas Wawrinka|Ryan Harrison|Juan Martin Del Potro|Jack Sock