Just walk there? lol. There is a hallway that leads to the rear dome from the 2nd floor mens locker room. That one hallway where you can watch people play racket ball from the 2nd floor. That hallway lead to the rear dome bypassing the tennis desk. They used to lock the ball machine too but now they just move it.
There are times I get kicked out by the people that reserved the court while im serving so I just move on to the next court. haha.