The term START THE TENNIS GAME can be solved by the crossword solution SERVE, which is a five letter word. In tennis, serving is the act of putting the ball into play by hitting it over the net to the opponent's side of the court. The server must hit the ball diagonally across the court and the ball must land in the service box on the opposite side. Serving is an important part of the game as it is the only way to start a point.