for Sydney and Memphis Del Potro received a wildcard,
for Delray Beach he didn't use his protected ranking ( he had a "special exempt" )
so he used his protected ranking only for 3 tournaments since the begining of the year:
1) Australian Open
2) San Jose
3) Indian Wells
he can again use his protected ranking for 5 tournaments until june
thx for the info, Elbarto!
Only till June? Since he's already in the top 100 and doesn't seem likely to fall out again, will it be to his advantage to use those 5 PRs?