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List of tennis umpires - Wikipedia
I Just Feel Robbed" - When Serena Williams Called A Chair Umpire Anti-Serena - EssentiallySports
Mariana Alves ends her job as a chair umpire. | Tennis Forum
Chair umpire Mariana Alves works the 2004 U.S. Open quarter final match between Serena Williams and Jennifer Capriati in New York, September 7, 2004. Several questionable calls were made during the match