So Novak Djokovic just got 2 850 000$ for a total of 12,803,737 . Last week it was $9,953,737 .
At the end of the season No1 player gets 2 000 000 dollars, if he plays all required masters 1000 tournaments (which Novak did play).
Here's a link to atp rulebook for more about that.
Also, even if we count 500 000$ from US open series, which Novak got, and they didn't count it in his prize money... so even if we count that thats 2,5 mill .
How and why did Novak got 2 850 000 dollars?