noun
tennis etiquette; court etiquette
Wasei-eigo term used in tennis and other court sports for proper behavior and manners on the court.
wasei-eigo (Japanese-coined English), from court manner
テニスではコートマナーを守ることが大切です。
In tennis, it is important to observe court etiquette.
彼は
He was warned about his poor court manners.