press the lob button (key -'C' in default case) & the down arrow key at the same time while serving ... but be sure you do not press the down arrow key for a long time , it can cause net fault !...
You need to be wearing a piece of fancy dress equipment for example i wear the superhero headgear, you usually unlock the fancy dress equipment by completing 3 or more stages of one of the mini games.
Basically, tennis is a game with two or four players divided equally on two halves of a court having a net stretched across its width. The players decide who is to "serve" first. The server will...