Wimbledon quiz: Could you be a line umpire? - BBC Sport
US Open 2020: World Number 1 Novak Djokovic disqualified after hitting line judge with tennis ball
Be a tennis line judge: Interactive tests your skills | FlowingData
You can't be the player's friend': inside the secret world of tennis umpires | Tennis | The Guardian
Wimbledon consider replacing line judges with an automated system for 2021 event | Tennis News | Sky Sports
McEnroe's Call for Tournament Line Judges: 'Out!' - The New York Times
Electronic Line Judge: Software System, Tennis, Works
Meet Wimbledon's unsung heroes battling for survival amid rise of the robots
Official (tennis) - Wikipedia
The U.S Open replaces human line judges with optical technology : NPR
How To Get Started In A Tennis Official Role | LTA
Kader Nouni: The Umpire Known as the 'Barry White of Tennis' - The New York Times
International Tennis Federation defends US Open chair umpire Carlos Ramos | Sports News,The Indian Express
About a linesman - TENNIS
Djokovic wants to replace line judges with technology - Why it is not that simple - Tennis Majors
Official (tennis) - Wikipedia
The Other Invisible Tennis Crew | WORLDkids
Orathip Sritawan: The only Thai line judge at Wimbledon | Main Stand
US Open does away with line judges, a year after Novak Djokovic was disqualified for hitting one - ABC News
Tennis Line Judge Photos and Premium High Res Pictures - Getty Images
