A formal or literary term for a tennis court. In everyday speech, テニスコート is far more common.
See also: テニスコート
This park has two tennis courts.
Compound of 庭球 (teikyū, 'tennis', literally 'garden ball') + 場 (jō, 'place'). 庭球 is a coined Japanese word for tennis, now largely replaced by the loanword テニス.