Ask about a specific match, it will be easier to answer.
There was no specific match in mind, I'm just wondering how the points are distributed. Let's say Novak Djokovic faces back to back players, each ranked just outside the top 100 in his first two matches in a Masters 1000, i'll call them Players A and B. He's played each player multiple times, dominated them; the points distribution for picking Player A vs Djokovic is 42-3. The points for picking Player B vs Djokovic in the subsequent round is 36-2.
So, I'm just wondering how exactly are the exact points determined? What makes a manager choose 42 instead of 36 points for the upset pick?