The Number of the Day: 42,000
The number of tennis balls used at Wimbledon is roughly 42,000.
Related Fact: According to The Telegraph, 1,540 gallons of cream consumed by Wimbledon patrons each year. Read more about Wimbledon here: Anyone for Tennis? 7 Wimbledon Questions Answered.
[Source: More! Level 4 Teacher's Book (Volume 4)]