The term 'Sport with a Service Line' is referring to the sport of SQUASH. SQUASH is a racquet sport that is played by two or four players in a four-walled court. The objective of the game is to hit the ball against the wall in such a way that the opponent is not able to return it. The service line is the line at the front of the court that marks the area from which the server must hit the ball. SQUASH is a popular sport worldwide and is played in many countries.