See main article: 2018 Fed Cup Americas Zone and 2018 Fed Cup. Pool B (Guayaquil) of the 2018 Fed Cup Americas Group II was one of four pools in the Americas Group II of the 2018 Fed Cup. Four teams competed in a round robin competition, with the top team and bottom teams proceeding to their respective sections of the play-offs: the top team played for advancement to Group I.
Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-team ties, head-to-head records; 4. in three-team ties, (a) percentage of sets won (head-to-head records if two teams remain tied), then (b) percentage of games won (head-to-head records if two teams remain tied), then (c) Fed Cup rankings.