1989 Davis Cup
The 1989 Davis Cup was the 78th edition of the Davis Cup, the most important tournament between national teams in men's tennis. This year's tournament saw the expansion of the previous World Group Relegation Play-offs round into the World Group qualifying round; instead of advancing directly to the World Group, the Zonal Group I winners would now join the World Group first round losers for a chance to compete in the following year's World Group. This year also marked the introduction of the tiebreak game|tiebreak], played at 6–6 in all sets except for the final set.
79 teams would enter the competition, 16 in the World Group, 14 in the Americas Zone, 19 in the Asia/Oceania Zone, and 30 in the Europe/Africa Zone. The Bahamas, Bahrain, the Dominican Republic, Kuwait and Jordan made their first appearances in the tournament.
West Germany defeated Sweden in the final, held at the Schleyer-Halle in Stuttgart, West Germany, on 15–17 December, to win their second consecutive Davis Cup title.
World Group
Final
'''West Germany vs. Sweden'''World Group qualifying round
Date: 20–24 JulyThe 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 1990 World Group.
| Home team | Score | Visiting team | Location | Venue | Door | Surface |
| 2–3 | ' | Eastbourne | Devonshire Park [Lawn Tennis Club] | Outdoor | Grass | |
| 2–3 | ' | Lima | Jockey Club del Perú | Outdoor | Clay | |
| 1–4 | ' | Aarhus | Aarhus Idrætspark | Indoor | Carpet | |
| ' | 4–1 | Auckland | Chase Stadium | Indoor | Carpet | |
| ' | 5–0 | Best | Best Leisure Centre | Indoor | Carpet | |
| 1–4 | ' | Seoul | Seoul [Olympic Park Tennis Center] | Outdoor | Hard | |
| ' | 4–1 | Mexico City | Club Alemán de México | Outdoor | Clay | |
| ' | 5–0 | Langenthal | Dreilinden Tenniscenter | Outdoor | Clay |
- ,, and remain in the World Group in 1990.
- ,, and are promoted to the World Group in 1990.
- ,, and remain in Zonal Group I in 1990.
- ,, and are relegated to Zonal Group I in 1990.
Americas Zone
Group I
- and advance to World Group qualifying round.
- relegated to Group II in 1990.
Group II
- promoted to Group I in 1990.
Asia/Oceania Zone
Group I
- relegated to Group II in 1990.
- and advance to World Group qualifying round.
Group II
- promoted to Group I in 1990.
Europe/Africa Zone
Group I
- ,, and advance to World Group qualifying round.
- and relegated to Group II in 1990.
Group II Europe
- promoted to Group I in 1990.
Group II Africa
- promoted to Group I in 1990.