when did this happen?
because nadal was basically AWOL/sad in fall 14-mid 16.
murray was coming back from surgery in 14 and in 15-mid 16 lesser than 12-13, especially peak level
federer was very good in Bo3, but couldn't keep up with Bo5 vs a prime ATG
wawa was the only one capable of doing so and he spanked djokovic in RG 15. Djokovic didn't play him in his 4 in a row, but had beaten him just before that in RG 15 and slams after that in USO 16
the greatest run of this century which would include level is from federer in mid-2005 to Dubai 07 btw. better competition by some distance.