Here's why Wimbledon uses 55,000 tennis balls a year - Los Angeles Times
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Curiosities of Wimbledon tennis balls - SlazengerHeritage
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How many tennis balls are used at Wimbledon every year, and how many portions of strawberries are served? Wimbledon: The Numbers! - Fun Kids - the UK's children's radio station
Balls - The Championships, Wimbledon - Official Site by IBM
Ever wondered how many tennis balls are used at Wimbledon? - YouTube
Here's why Wimbledon uses 55,000 tennis balls a year - Los Angeles Times