The Davis Cup
is the premier international team event in men's tennis. It is run by the International Tennis Federation (ITF) and Kosmos Holding and is contested annually between teams from competing countries in a knock-out format. It is described by the organisers as the "World Cup of Tennis", and the winners are referred to as the World Champion team. The competition began in 1900 as a challenge between Great Britain and the United States. By 2016, 135 nations entered teams into the competition. The most successful countries over the history of the tournament are the United States and Australia. The present champions are Spain, who beat Canada to win their sixth title in 2019.