Official (tennis) - Wikipedia
McEnroe's Call for Tournament Line Judges: 'Out!' - The New York Times
Line judge definition and meaning | Collins English Dictionary
Take your first step to become a Line Umpire today! | 18 November, 2019 | Tennis SA
2,442 Tennis Chair Umpire Photos and Premium High Res Pictures - Getty Images
A day in the life of a US Open line umpire
At the U.S. Open, that voice yelling 'Out!' comes from a computer | Reuters
Tennis Line Judge Photos and Premium High Res Pictures - Getty Images
How To Get Started In A Tennis Official Role | LTA
Roles of Officials - Tennis Canada
Officials at a tennis match
How Much Do Tennis Umpires Get Paid? - Perfect Tennis
Tennis Line Call App by Line Call LLC
A day in the life of a US Open line umpire
Carlos Ramos, Umpire Known for Rigidity, Lands in U.S. Open Firestorm - The New York Times
The U.S Open replaces human line judges with optical technology : NPR
Putting It All on the Line at the U.S. Open - WSJ
How To Become A Wimbledon Tennis Umpire
Officiating in Tennis | ITF
How do I become … a Wimbledon umpire | Work & careers | The Guardian
How To Get Started In A Tennis Official Role | LTA
About a linesman - TENNIS
Line umpires - The Championships, Wimbledon - Official Site by IBM
How do I become … a Wimbledon umpire | Work & careers | The Guardian
