Tennis

Which of the following is considered bad tennis etiquitte?

More Questions from Tennis
Which tennis term is defined as "a shot that lands outside the playing area"?
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Who was the winner of the men's singles at the 2016 US Open?
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When Bjorn Borg retired from tennis, which record did he hold?
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Who was ranked number one in men's tennis in 1999?
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Who was the runner-up in tennis' 2002 Wimbledon Singles Championship?
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Tennis player Novak Djokovic is from what country?
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What is the first name of retired tennis champion Goolagong?
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What country is ladies tennis pro Shinobu Asagoe from?
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