2018 Davis Cup World Group Play-offs
The 2018 Davis Cup World Group Play-offs were held from 14 to 16 September. They were the main play-offs of the 2018 Davis Cup. The winners of the playoffs advance as seeded to the 2019 Davis Cup Qualifying Round.Teams
Bold indicates team had qualified as seeded to the 2019 Davis Cup Qualifying Round.
;From World Group
; From Americas Group I
; From Asia/Oceania Group I
; From Europe/Africa Group I
Date: 14–16 September
The eight losing teams in the World Group first round ties and eight winners of the Zonal Group I final round ties competed in the World Group Play-offs for spots in the 2019 Qualifying Round. The draw took place on April 10 in London.
Seeded teams
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Unseeded teams
| Home team | Score | Visiting team | Location | Venue | Door | Surface |
| ' | 4–0 | | San Juan | Estadio Aldo Cantoni | Indoor | Clay |
| ' | 3–1 | | Glasgow | Commonwealth Arena | Indoor | Hard |
| ' | 3–1 | | Graz | Messe Congress Graz | Outdoor | Clay |
| 2–3 | ' | Biel/Bienne | Swiss Tennis Arena | Indoor | Hard |
| ' | 4–0 | | Kraljevo | Kraljevo Sports Hall | Indoor | Clay |
| ' | 3–1 | | Toronto | Coca-Cola Coliseum | Indoor | Hard |
| 2–3 | ' | Budapest | Kopaszi Dam | Outdoor | Clay |
| ' | 4–0 | | Osaka | Utsubo Tennis Center | Outdoor | Hard |
Play-off results
Argentina vs. Colombia
Austria vs. Australia
Switzerland vs. Sweden
Serbia vs. India
Canada vs. Netherlands
Hungary vs. Czech Republic
Japan vs. Bosnia and Herzegovina
