The Play-offs of the 2005 Fed Cup Americas Zone Group I were the final stages of the Group I Zonal Competition involving teams from the Americas. Using the positions determined in their pools, the nine teams faced off to determine their placing in the 2005 Fed Cup Americas Zone Group I, the top countries of each pool played for first to second, while the bottom two of each pool competed for fifth to eighth. The teams that ended up placing first overall advanced to World Group II Play-offs, whilst those coming in seventh were relegated down to Group II for the next year.
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Promotional Play-Offs
The first placed teams of each pool were placed against each other in a head-to-head round. The winner of the rounds advanced to the World Group II Play-offs, where they would get a chance to advance to the World Group II for next year.
Third to Fourth Play-off
The second placed teams of each pool were placed against each other in a tie. The winner of the tie was allocated third place in the Group while the loser was allocated fourth.
Relegation Play-Offs
The last and second-to-last placed teams of each pool were placed against each other in two head-to-head rounds. The losing team of the rounds were relegated to Group II for next year.