See main article: 2017 Davis Cup. The 2017 Davis Cup World Group play-offs were held from September 15 to 17. They were the main play-offs of the 2017 Davis Cup. The winners of the playoffs advanced to the 2018 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
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Bold indicates team had qualified for the 2018 Davis Cup World Group.
Date: 15–17 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 2018 World Group. The draw took place on April 11 in London.
Seeded teams
Unseeded teams
| Home team | Score | Visiting team | Location | Venue | Door | Surface | |
|---|---|---|---|---|---|---|---|
| 3–2 | Indoor | Hard | |||||
| 1–4 | Outdoor | Clay | |||||
| 3–2 | Swiss Tennis Arena | Indoor | Hard | ||||
| 3–2 | Sportcampus Zuiderpark | Indoor | Clay | ||||
| 2–3 | Clube de Ténis do Jamor | Outdoor | Clay | ||||
| 3–1 | Outdoor | Hard | |||||
| 3–1 | Margaret Island Athletic Centre | Outdoor | Clay | ||||
| 3–2 | Indoor | Hard |