Ok, redrew it, you can see the triangles
I definitely understand more after the clarificaiton, and interesting enough, the vast majority of djokovics shots are in those two triangles. It definitely is more interesting to think about than the old adage of "hit deep"
I think a major problem i have struggled with myself is I haven't focused on hitting to zones, or smart targets as you refer to them (which I like). And the next time i'm on the court I will definitely be thinking about these and focusing on hitting into these zones when i am in an attacking position.