Originally Posted by sureshs
Deep means beyond the service line. It is clear that Djokovic hits deep.
Looks like you missed the definitions in the OP!
That is incorrect for the purposes of this discussion.
I can add that no instructor would consider barely hitting past the svc line a deep shot,
but would instead be considered acceptable
by some standards, but clearly not deep.
Dr Allen Fox refers to hitting AT Least
half way between svc line & BL as a miniumum
in "Think to Win"
, where in this discussion that is closer to "ideal depth".
Often the balls we see attacked for winners are well beyond the svc line though,
so you give further evidence that deep alone (by your definition) is not protection from getting attacked.
Your comment is also a good example of the confusions about depth and it's significance.
Deep is even often considered a correct callout for an "out" ball that is long, so yes, DJ does hit some deep as well by that standard. This is why I started with some definitions to start the discussion.