Line Judge Meaning in Tennis

A line judge watches specific court lines during play. Each judge focuses on one assigned area. Their job is to call balls in or out. They signal immediately after the ball lands. Accuracy and focus are critical. Line judges must react within seconds. Players depend on their sharp vision. For example a fast serve lands near the sideline. The line judge quickly signals out. That decision affects the point outcome. In some events electronic systems replace line judges. However the role remains important in many matches.