Unless they have changed the points weighting, it should be another 95 (50 + 45).
Anyway, you're right in saying that Federer can barely afford to lose...and Nadal could still freeze him out anyway.
If roger does lose, novak ready to pounce. he still has a chance of taking number 2 from roger.
This probably been the most exciting atp race for a long time. The still alot of players within a chance in getting into the tennis master cup.