See main article: 1990 Davis Cup.
The Americas Zone was one of the three zones of the regional Davis Cup competition in 1990.
In the Americas Zone there were two different tiers, called groups, in which teams competed against each other to advance to the upper tier.
Winners in Group I advanced to the World Group qualifying round, along with losing teams from the World Group first round. Teams who lost their respective first round ties competed in the relegation play-off, with the winning teams remaining in Group I, whereas the team who lost their play-off was relegated to the Americas Zone Group II in 1991.[1]
The winner in Group II advanced to the Americas Zone Group I in 1991.