Cincinnati in a minute
Want to just turn up? Sundin Fields is 3 km away. The City of Mason says its lit courts are open when nobody has them booked for a program.
That's 3 km from the Lindner Family Tennis Center in Mason, home of the Cincinnati Open. Its own courts rent too. Members book ahead. Everyone else books the same day: $15 an hour outdoors, $25 indoors.
In Cincinnati itself, the Recreation Commission lists 14 places as public courts, and that's all it says. Lunken Tennis Center takes a phone call, and has clay. This guide tells you which is which.
Read the Cincinnati guide