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Kader Nouni: The Umpire Known as the 'Barry White of Tennis' - The New York Times
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Djokovic out of US Open after hitting line judge with ball | The Seattle Times
Tennis referee hi-res stock photography and images - Alamy
About a linesman - TENNIS
How To Get Started In A Tennis Official Role | LTA
Who is US Open tennis umpire Marijana Veljovic? | The US Sun
Stunning Serbian umpire Marijana Veljovic sends fans wild in Australian Open bust-up with Kyrgios | The US Sun
Gerry Armstrong appointed Championships Referee Designate | Tennis News | Sky Sports
Are Referees Unfair to Female Players? | Psychology Today
Officiating in Tennis | ITF
Who was the line judge hit by a tennis ball struck by Novak Djokovic at the US Open? | The US Sun
Official (tennis) - Wikipedia
Tennis Referee, Chair Umpire Editorial Photo - Image of compete, clay: 70091971
A robot referee can really keep its 'eye' on the ball
