- Source: 1981 Davis Cup World Group
The World Group was the highest level of Davis Cup competition in 1981. It was the first edition of the newly formed 16-team World Group and a move to a tiered system including promotion and relegation. The original 16 teams to compete were chosen through the previous year's results, with teams that reached the 1980 Zonal semifinals chosen to compete in the inaugural bracket. The first-round losers would play in the Davis Cup World Group Relegation Play-offs, with the four losers relegated to their respective Zonal competitions the following year and replaced by the four winners of the current year's Zonal competitions.
Czechoslovakia were the defending champions, but were eliminated in the quarterfinals.
The United States won the title, defeating Argentina in the final, 3–1. The final was held at the Riverfront Coliseum in Cincinnati, Ohio, United States from 11 to 13 December. It was the US team's 27th Davis Cup title overall.
Participating teams
= Draw
=First round
= West Germany vs. Argentina
== Romania vs. Brazil
== Great Britain vs. Italy
== South Korea vs. New Zealand
== Japan vs. Sweden
== France vs. Australia
== Switzerland vs. Czechoslovakia
== United States vs. Mexico
=Quarterfinals
= Romania vs. Argentina
== New Zealand vs. Great Britain
== Sweden vs. Australia
== United States vs. Czechoslovakia
=Semifinals
= Argentina vs. Great Britain
== United States vs. Australia
=Final
= United States vs. Argentina
=Relegation play-offs
The first-round losers played in the Relegation Play-offs. The winners of the play-offs advanced to the 1982 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions.
= Results summary
=Date: 2–4 October
France, Italy, Mexico and West Germany remain in the World Group in 1982.
Brazil, Japan, South Korea and Switzerland are relegated to Zonal competition in 1982.
= Brazil vs. West Germany
== Italy vs. South Korea
== France vs. Japan
== Mexico vs. Switzerland
=References
External links
Davis Cup official website
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- 1981 Davis Cup World Group
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