When my sister is here she goes to a few different ones. GEBA you can access with a tennis coach like
@Digital Nomad mentions. But it's easy to find a coach there.
She also goes to this one that is open to the public.
Circuito-KDT (Ex-KDT)
Located in Parque Manuel Belgrano, this public facility is ideal for short-term visitors.
- 8 red clay tennis courts
- 1 hard court
- Pay-per-play option without membership requirement
- Reasonable fees
Other Accessible Clubs
- Costa Rica Gym & Tennis: Located at Costa Rica 4863, this club offers well-maintained courts
https://www.costaricatenis.com/
- El Abierto Tennis Club: Situated at Galván 3920, it features good hard courts
http://www.elabiertoclub.com/
- Villa Tennis: Found at C. Estado Plurinacional de Bolivia 2233, this is another option for tennis enthusiasts
http://www.agtenis.com.ar/
- A.G.Tenis-Argentina: Located at Club Obras, Av. del Libertador 7273, this club also offers tennis facilities.
There are other private clubs but you have to have a member guest you in.