See main article: 2018 Davis Cup.
The Africa Zone was the unique zone within Group 3 of the regional Davis Cup competition in 2018. The zone's competition was held in round robin format in Nairobi, Kenya, from 18 to 23 June 2018. The two winning nations won promotion to Group II, Europe/Africa Zone, for 2019.
Date: 18–23 June
Location: Nairobi Club Ground, Nairobi, Kenya (clay)
Format: Round-robin basis. One pool of four teams (Pool A) and one pool of five teams (Pool B). The winners of each pool play-off against each other to determine which two nations are promoted to Europe/Africa Zone Group II in 2019.
| Pot | Nation | Rank1 | Seed |
|---|---|---|---|
| 1 | 79 | 1 | |
| 86 | 2 | ||
| 2 | 88 | 3 | |
| 102 | 4 | ||
| 3 | 106 | 5 | |
| 120 | 6 | ||
| 4 | 122 | 7 | |
| 127 | 8 | ||
| NR | 9 | ||
Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-team ties, head-to-head records; 4. in three-team ties, (a) percentage of sets won (head-to-head records if two teams remain tied), then (b) percentage of games won (head-to-head records if two teams remain tied), then (c) Davis Cup rankings.
| Placing | A Team | Score | B Team |
|---|---|---|---|
| Promotional | 1–2 | ||
| Promotional | 1–2 | ||
| 5th–6th | 1–2 | ||
| 7th–8th | 0–2 | ||
| 9th | colspan=2 |