free tennis courts in brooklyn?

Does anyone know of tennis courts in Brooklyn that are free? Just at random parks and such. For some reason I would be left feeling a little ripped off if we had to pay 7 bucks per person for only an hour of play ;\


If anyone else is interested, I just found this: http://www.nycgovparks.org/sub_things_to_do/facilities/af_tennis_outdoor.html