Fognini's coach tweeted a few days ago that Sao Paulo's courts were in terrible conditions and the balls weren't suitable for professionals. Other players have complained in pressers too with Alexander Peya today saying all of them were in bad condition. A photo of lines coming off:
Also reports that Nadal's not happy with the balls - he and his team having a discussion with the organizers about the conditions of the balls (apparently too soft - not the correct pressure):
Should be an interesting week. Pretty poor for a tour level competition to have such issues with all players complaining about it.