answers: United States
context: States. The Czech Republic competed in its first Davis Cup in 1921, as Czechoslovakia. Here is the list of all match-ups since 1981, when the competition started being held in the current World Group format. Czech Republic Davis Cup team The Czech Republic Davis Cup team represents the Czech Republic in Davis Cup tennis competition and are governed by the Czech Tennis Federation. The Czech team was started in 1993, following the break-up of Czechoslovakia. The Czech Republic won the Davis Cup in 1980 as Czechoslovakia, and in 2012 and 2013 as the Czech Republic in Prague and Belgrade respectively. </s> I in seasons 2013, 2014, and 2015. In 2016, it was relegated to the Europe/Africa Zone Group II, and in 2017 it is attempting to return to the Europe/Africa Zone Group I, with the next match (in Round 2) scheduled for April against Turkey. Sweden entered their first competition in 1925. Sweden Davis Cup team The Sweden Davis Cup team () represents Sweden in Davis Cup tennis competition and is governed by the Swedish Tennis Association. As of 2016, Sweden is the 5th most successful nation in Davis Cup history, having won the title 7 times, 6 of which have </s> and finishing as runners-up 29 times) and Australia (winning 28 times, including four occasions with New Zealand as Australasia, and finishing as runners-up 19 times). The present champions are Croatia, who beat France to win their second title in 2018. The women's equivalent of the Davis Cup is the Fed Cup. Australia, the Czech Republic, and the United States are the only countries to have held both Davis Cup and Fed Cup titles in the same year. The Hopman Cup, a third competition for mixed teams, carries less prestige, but is a popular curtain raiser to the tennis season. Only
question: which country has won most davis cups in tennis