The referee must see the whole court, what is happening on the court, always. Height is crucial for them; visibility must be optimal and unobstructed. The height of the tennis chair should be between 1.70 and 1.80 metres, so that the referee is elevated. The most important thing is always to be able to see the tennis ball. Comfortable models for the chair umpire

They must also ensure that they have all of the correct equipment with them needed to officiate the match, such as a whistle, stopwatch and mark cards.Clarin (31 March 1998). "Gumy promises a victory against the number one of the world" . Retrieved 26 June 2022.

Due to unsportsmanlike conduct at the conclusion of his doubles match on Tuesday night, Alexander Zverev has been withdrawn from the tournament in Acapulco," an ATP statement read. And then the ATP's senior vice-president for rules and competition must decide whether Zverev's behaviour constitutes a 'Player Major Offence'. Somat officiated many Grand Slam matches [85] before being decertified by the ITF for an apparent breach of the code of conduct. [86]Find sources: "Umpire"– news · newspapers · books · scholar · JSTOR ( March 2021) ( Learn how and when to remove this template message)

Only South American Chair Umpire at the 1996 Summer Olympics event. Worked the Australian, US and French Opens and several Davis Cup ties. [55] He umpired the only tennis match where Marcelo Ríos played as number one of the world, Ríos-Gumy in a 1998 Davis Cup American zone match between Argentina and Chile. [56] Two hours after the match the ATP announced Zverev had been defaulted from his singles match and withdrawn from the tournament. “Due to unsportsmanlike conduct at the conclusion of his doubles match Alexander Zverev has been withdrawn from the tournament in Acapulco,” a tournament statement said.The ATP defines unsportsmanlike conduct as "any misconduct by a player that is clearly abusive or detrimental to the success of a tournament, ATP and/or the sport".