戴维斯杯网球赛The Davis Cup is the international team event in men's
The largest annual team competition in sport, the Davis Cup is run by the and is contested between teams of players from the competing countries in a knock-out format
The women's equivalent of the Davis Cup is the (known as the Federation Cup before )
Each round consists of 5 matches (known as a rubber or a tie) between two countries
The first two matches are singles, the third is a doubles match, and in the last two matches (the reverse singles) the first contestants play again, but swap opponents from the earlier matches
There is no restriction on who may play the doubles match: the two singles players, two other players (usually doubles specialists) or a combination
If one team has already clinched the rubber