Naoki Tajima defeated Issei Okamura 6-4 6-3 in the M25 Carrara 1 q16 on hard. The result followed the form book — Naoki Tajima came in ranked #1391, leading the head-to-head 3–0. Naoki Tajima extended the head-to-head to 4–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2024-06-05 | M15 Harmon 1 | R32 | hard | Naoki Tajima | 3-6 6-3 6-3 |
| 2019-03-27 | M15 Tsukuba 1 | R32 | hard | Naoki Tajima | 6-3 6-4 |
| 2019-01-10 | M15 Anning 2 | R16 | clay | Naoki Tajima | 4-6 6-3 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.