what are the tennis courts at wimbledon made from
Tennis court Of the current four Grand Slam tournaments, the Australian and US Open use hard courts, French Open is played on clay, and Wimbledon, the only Grand Slam to have always been played on the same surface, is played on grass. The Australian Open switched to hard courts in 1988 and in its early years the French championship alternated between clay and sand/rubble courts. The US Open is the only major to have been played on three surfaces; it was played on grass from its inception until 1974, clay from 1975 until 1977 and hard courts since it moved from the West Side Tennis Club to the National Tennis Center in 1978.
The Championships, Wimbledon The All England Club, through its subsidiary The All England Lawn Tennis Ground plc, issues Debentures to tennis fans every five years to raise funds for capital expenditure. Fans who invest thus in the club receive a pair of tickets for every day of the Wimbledon Championships for the five years the investment lasts.[62] Only debenture holders are permitted to sell on their tickets to third parties and demand for debentures has increased in recent years, to such an extent that they are even traded on the London Stock Exchange.