The term 'Tennis Server's Spot' refers to the area on a tennis court where the server stands when they are serving the ball. This area is also known as the baseline, which is an 8 letter word that can be used to solve the crossword. The baseline is the back line of the court, and it is where the server must stand when they are serving the ball. The server must stay within the baseline until the ball is hit, and then they can move anywhere on the court.