<Li> Service line: The line that is parallel to the net and is located between the baseline and the net . It marks the end of the service boxes . </Li> <Li> Side T: The T shape formed by the service line and the singles sideline . There are four such side Ts, two on each side of the net . </Li> <Li> T or Middle T: The T shape formed by the service line and the center service line . </Li>

2. the playground of lawn tennis is called