Tennis court
From Tardis Wiki, the free Doctor Who reference
A tennis court was the ground on which the sport of tennis was played. Tennis courts had nets hung across the middle, and opponents would stand on either side of this net. (PROSE: Thirty Love)
On Tiermann's World, the grounds surrounding the Dreamhome contained two tennis courts. (PROSE: Sick Building)
The pleasure planet A-Lux had sub-aqua tennis courts. (COMIC: A Cold Day in Hell!)