Djokovic snaps at Wimbledon chair umpire en route to Week 2
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Carlos Ramos, Umpire Known for Rigidity, Lands in U.S. Open Firestorm - The New York Times
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Kader Nouni: The Umpire Known as the 'Barry White of Tennis' - The New York Times
The U.S Open replaces human line judges with optical technology : NPR
