Tennis

Which of the following is considered bad tennis etiquitte?

More Questions from Tennis
Which player was known as "Boom Boom" when he first entered professional tennis?
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Who was the runner-up in tennis' 2003 Wimbledon Singles Championship?
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Which tennis term is defined as "container that holds large amount of balls"?
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Who won the 2001 French Singles Championship?
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Who was the runner-up in tennis' 2004 U.S. Open Singles Championship?
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In 2014, who became only the second Swiss man to win a Grand Slam singles title after Roger Federer?
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What has Andre Agassi done that only four other pro tennis players have achieved?
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Which player defeated Novak Djokovic in the 2014 French Open final to win his ninth French Open title?
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