Sorry, I should have explained where I saw the abbreviations, I meant in the draws of tournaments. I looked them up, and what I was thinking of were the International Olympic Committee codes, whereas the ones you used were the ISO codes. While I think the ISO codes are more confusing, I guess they are more standard.
2010 Singles: 66-10 (no wo (4))
2010 Doubles: 21-11
2009 Singles: 105-14 (no WO (6))
2009 Doubles: 11-8
'10: W: AO, Miami, Casa, Barca, Rome, Stuttgart, Hamburg, Cincy
'09: W: 13 including Rome, Madrid, RG, Wimby, Cincy, USO