See main article: 2018 Davis Cup.
The Asia/Oceania Zone was the unique zone within Group 4 of the regional Davis Cup competition in 2018. The zone's competition was held in round robin format in Muscat, Oman, from 29 January to 3 February 2018. The two winning nations won promotion to Group III, Asia/Oceania Zone in 2019.
Date: 29 January–3 February
Location: Sultan Qaboos Sports Complex, Muscat, Oman (hard)
Format: Round-robin basis. Two pools of six teams. The winner of Pool A will play-off against the runner-up in Pool B and the winner of Pool B will play-off against the runner-up in Pool A to determine which two nations will be promoted to Asia/Oceania Zone Group III in 2019.
| Pot | Nation | Rank1 | Seed |
|---|---|---|---|
| 1 | 103 | 1 | |
| 106 | 2 | ||
| 2 | 109 | 3 | |
| 111 | 4 | ||
| 3 | 112 | 5 | |
| 113 | 6 | ||
| 4 | 114 | 7 | |
| 115 | 8 | ||
| 5 | 116 | 9 | |
| 117 | 10 | ||
| 6 | 127 | 11 | |
| NR | 12 |
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 | 2–0 | |||
| Promotional | 1–2 | |||
| 5th–6th | 0–2 | |||
| 7th–8th | 1–2 | |||
| 9th–10th | 1–2 | |||
| 11th–12th | 3–0 |