Tennis

Which of the following is considered bad tennis etiquitte?

More Questions from Tennis
Which athlete is known for their accomplishments in tennis?
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How many of Rafael Nadal's first 25 matches of 2006 did he win?
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Which doubles tennis players managed to retain their title at the 2014 Australian Open?
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Who was named "Most improved player 2000" in women's tennis?
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How many U.S. Open singles titles did John McEnroe win?
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Which tennis star won the 2016 ATP Auckland Open?
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What is the first name of tennis' Williams?
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Who won the 2015 ATP World Tour Masters 1000 Indian Wells?
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