The 2006 Davis Cup was the 95th edition of the most important tournament between nations in men's tennis. Sixteen teams participated in the World Group and 125 participated in total. The first round matches were played 10–12 February and the final took place 1–3 December 2006 at the Olympic Stadium, Moscow, with Russia defeating Argentina.
The 1981 Davis Cup was the 70th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 53 teams would enter the competition, 16 in the World Group, 23 in the Europe Zone, 8 in the Americas Zone, and 6 in the Eastern Zone.
The 1987 Davis Cup was the 76th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 72 teams would enter the competition, 16 in the World Group, 32 in the Europe Zone, 13 in the Eastern Zone, and 11 in the Americas Zone.
The 1988 Davis Cup was the 77th edition of the Davis Cup, the most important tournament between national teams in men's tennis. This year's tournament marked the introduction of sub-divisions within each continental zone. Each zone would now feature two groups, with promotion and relegation between the two. This year also saw the Eastern Zone renamed as the Asia/Oceania Zone. 75 teams would enter the competition, 16 in the World Group, 13 in the Americas Zone, 16 in the Asia/Oceania Zone, and 30 in the Europe/Africa Zone. Cameroon, Ghana, Haiti, Iraq and Jamaica made their first appearances in the tournament.
The 1989 Davis Cup was the 78th edition of the Davis Cup, the most important tournament between national teams in men's tennis. This year's tournament saw the expansion of the previous World Group Relegation Play-offs round into the World Group qualifying round; instead of advancing directly to the World Group, the Zonal Group I winners would now join the World Group first round losers for a chance to compete in the following year's World Group. This year also marked the introduction of the tiebreak, played at 6–6 in all sets except for the final set.
The 1991 Davis Cup was the 80th edition of the Davis Cup, the most important tournament between national teams in men's tennis. 88 teams would enter the competition, 16 in the World Group, 20 in the Americas Zone, 20 in the Asia/Oceania Zone, and 32 in the Europe/Africa Zone. Congo, the Eastern Caribbean, El Salvador and Saudi Arabia made their first appearances in the tournament.
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.
The World Group was the highest level of Davis Cup competition in 1982.
The World Group was the highest level of Davis Cup competition in 1983.
The World Group was the highest level of Davis Cup competition in 1984.
The World Group was the highest level of Davis Cup competition in 1985.
The World Group was the highest level of Davis Cup competition in 1986.
The World Group was the highest level of Davis Cup competition in 1987.
The World Group was the highest level of Davis Cup competition in 1989. The first-round losers went into the Davis Cup World Group qualifying round, and the winners progressed to the quarterfinals and were guaranteed a World Group spot for 1990.
The 1989 Davis Cup World Group qualifying round was held from 20 to 24 July. They were the main play-offs of the 1989 Davis Cup. The winners of the playoffs advanced to the 1990 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
The 1990 Davis Cup World Group qualifying round was held from 21 to 23 September. They were the main play-offs of the 1990 Davis Cup. The winners of the playoffs advanced to the 1991 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
The 1991 Davis Cup World Group qualifying round was held from 20 to 22 September. They were the main play-offs of the 1991 Davis Cup. The winners of the playoffs advanced to the 1992 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
The 1992 Davis Cup World Group qualifying round was held from 25 to 27 September. They were the main play-offs of the 1992 Davis Cup. The winners of the playoffs advanced to the 1993 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
The 1993 Davis Cup World Group qualifying round was held from 22 to 27 September. They were the main play-offs of the 1993 Davis Cup. The winners of the playoffs advanced to the 1994 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
The 1996 Davis Cup World Group qualifying round was held from 20 to 22 September. They were the main play-offs of the 1996 Davis Cup. The winners of the playoffs advanced to the 1997 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
