Mariana Alves

Mariana Alves (b. September 23, 1972) is a Portuguese Tennis Chair Umpire. She is one of only a few women who currently hold a Gold Badge in Chair Umpiring from the International Tennis Federation; others include Eva Asderaki (GRE), Lynn Welch (USA), Kerrilyn Cramer (AUS), Louise Engzell (SWE) and Alison Lang (UK).
Career
In the 2004 US Open quarterfinal between Serena Williams and Jennifer Capriati, Alves made several disputed calls in the deciding set, one of which was clearly shown by television replays to have been incorrect. Due to the angles of the cameras, it was difficult to tell if two baseline calls were correct or not. There were also 1 or 2 service line calls that were called by "Cyclops," and the chair umpire was not allowed to overrule Cyclops except for the case of an obvious malfunction. US Open officials removed Alves from consideration for officiating further matches at that year's tournament and apologized to Williams for Alves's errors. Alves continued to officiate matches after that tournament, however. The Capriati/Williams match is regarded in the tennis community as being a major contributing factor in the adoption of Hawk-Eye line-calling technology at the US Open.

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