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Suan Rot Fai Basketball Court (and tennis courts)
Located in the Chatuchak park, on walking distance from Mo Chit BTS. Next to the basketball courts are five good tennis courts situated. If you are lucky you can play here for free but it can happen that someone is walking around and asks you for some money. But even then it is cheap and the courts are suprisingly good. It is not possible to book in advance here, but at the times I played there, all courts were available.
Bring your own water as you can not buy any liquid nearby.