If by "donut" you mean hentai, then yes.
A sphere is round - like a tennis ball. A torus is ring-shaped - like a donut !
You probably mean "Lawn" tennis. Lawn tennis is simply tennis played on a grass court.
tennis
tennis courts
means - front side of the tennis field
It's basically rankings in Tennis.
To be 'as dead as a donut' is to be utterly dead, devoid of life (when applied to people, plants or animals) or finished with, unusable (when applied to inanimate objects).
It's either doughnut or donut. It's a pastry.
umm i assume you mean doughnut, which can also be spelled donut
What do you mean by example? Striking the tennis ball with your racquet? Or are you asking how to show someone how to play tennis?
something to do with Tennis, as this is the famous Tennis match series.