How many tennis balls are used during the Australian Open, and how often is a new ball used during a men's match?
by 
deja bloom
ANSWERS: 1
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Around 40,000 tennis balls are used during the Australian open. Balls are changed over every nine games. The first change happens after seven games because they are also used in the pre-match warm-up. After a extended break in play, usually caused by rain, a re-warm-up is done with a separate set of balls and then when play resumes with the use of the match balls.
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