Wimbledon is the oldest tennis tournament in the world, held annually since 1877 at the All England Club in London. It is one of the four Grand Slam tennis tournaments and is unique as the only major played on grass. The 2012 Olympic tennis tournament was held at Wimbledon from July 28th to August 5th, featuring 172 players competing in men's and women's singles and doubles as well as mixed doubles for medals.