I think that you will find he will have 2 sets of Buenos Aires points for a week so whatever he does in Rio will go with his 500 requirement, but he will drop 250 for BA 2013 and I think 90 from Auckland if he gets more than 90 in Rio? If I am correct it will mean little gain for Ferrer on Andy before Acapulco. He could even lose some points but that is hopeful. Not too bad. Lots to play for in the next few months. Del Potro losing is a big bonus.
If I've worked this out right, I think he'll drop the 90 from Auckland on Monday if he wins the semi-final tonight, counting BA instead. Then next week if he gets to the Rio SFs or better that result will replace the 250 BA points from last year - otherwise the Auckland points will go back on his ranking. He's playing an extra tournament compared to this time last year so has the chance to gain points, or to keep his ranking stable if he loses early in one of the events.
Should be an interesting couple of months ahead - looks like Ferrer/Delpo/Andy/Berdych will be very close in the rankings though all have quite a lot of points to defend in IW and/or Miami.