a person designated to observe the passage of tennis balls over the boundary lines of the court. A Line Judge can declare that a play was within or outside of the play area and cannot be overruled by the players. A line Judge must defer to an Umpire's decision, even when it contradicts their own observations.

An official who keeps track of time and also watches for various violations, including the quarterback's position when passing (the quarterback isn't allowed to go past the line of scrimmage to pass).

The official on the field who watches for illegal motion and illegal shifts. They assist all of the other officials. The line judge is responsible for overseeing the timing of the game .He takes over the timing if the scoreboard clock malfunctions.

Official in the Distance event who determines if a foot fault has occurred

Helps decide appeal calls. Two line judges can overrule the referee on appealable calls.