The worst would be second. Cause I mean third you can say, well atleast I placed. But second, you're the highest loser. No one lost, higher than you.
Do the points from previous comps lose value over time? Let's say, once a results is ten comps old it is halved? Or perhaps after each full season of competition that seasons total points are halved as we head into the next.
Should do what they do in real tennis. Every year when you play a tournament, you lose the points you gained from that tournament last year.