See main article: 1998 Davis Cup. The 1998 Davis Cup World Group qualifying round was held from 25 to 28 September. These were the main play-offs of the 1998 Davis Cup. The winners of playoffs advanced to the 1999 Davis Cup World Group, and the losers were relegated to their respective Zonal Regions I.
Bold indicates team had qualified for the 1999 Davis Cup World Group.
Date: 25–28 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 qualifying round for spots in the 1999 World Group.
| Home team | Score | Visiting team | Location | Venue | Door | Surface | ||
|---|---|---|---|---|---|---|---|---|
| 5–0 | Indoor | Hard | ||||||
| 3–0 | Hotel Costão do Santinho | Outdoor | Clay | |||||
| 5–0 | National Tennis Centre | Outdoor | Clay | |||||
| 1–4 | Outdoor | Hard | ||||||
| 3–2 | Outdoor | Hard | ||||||
| 5–0 | Indoor-Sportcentrum Eindhoven | Indoor | Carpet | |||||
| 1–3 | Outdoor | Hard | ||||||
| 2–3 | Outdoor | Clay |