Originally Posted by axel89
when im at a tournament there's like 2 usta officals that do nothing or even call lines
The officials are not there to call lines unless they are in a chair. They are roving to make sure matches are progressing in a timely manner and to come onto court as needed.
As for your comment, I would assume these officials could be the referee and deputy referee who have more important things to do than walking around calling lines,such as assisting with rules questions, draws questions, etc....