The World Group I play-offs were four ties which involved the losing nations of the World Group and the winning nations of the World Group II. Nations that won their play-off ties entered the 2019 World Group, while losing nations joined the 2019 World Group II.
| Participating Teams | |||
|---|---|---|---|
 Australia |
 Belarus |
 Belgium |
 Italy |
 Netherlands |
 Romania |
 Slovakia |
 Switzerland |