The French Open results for the British players will be critical for the British women as to who qualifies. There will be 56 players who qualify. These would be based on rankings but there is a cap of 4 players from any one country. So it is thought that the players in the top 70 have a fair chance of qualifying. That means that Elena Baltacha will be right on the edge of qualifying as she got to the 2nd round last year at the French Open so could drop in the rankings.
Anne Keothavong only got to the first round last year so she has a decent chance of getting to the second round this time so could go up in the rankings.
Heather Watson would have to do better than she did last year when she got to the second round, so she will have to get to at least the 3rd round to have any chance of getting qualification to the Olympics.
There are 8 wildcards for the Olympics so there may still be a chance for those who don't qualify by right.