The term 'Major Tennis Event' refers to two of the four most important annual tennis tournaments in the world. The first is the OPEN, also known as the British OPEN or Wimbledon, which is held in London and has been running since 1877. The second is the US OPEN, which is held in New York City and has been running since 1881. Both tournaments are considered Grand Slam events and attract the best players from around the world.