Naoki Nakagawa
Naoki Nakagawa is a Japanese tennis player. Nakagawa along with Omar Jasika was the holder of US Open boys' doubles title after defeating Rafael Matos and João Menezes at the 2014 US Open. Nakagawa has a career-high ATP singles ranking of no.531 achieved on 24 July 2017.Singles
| Outcome | No. | Date | Tournament | Surface | Opponent | Score |
| Winner | 1. | | Mexico F13 | Hard |  Juan Carlos Spir | 6–3, 6–4 |
| Runner-up | 1. | | USA F37 | Clay |  Gianni Mina | 6–4, 4–6, 0–6 |
| Runner-up | 2. | | Croatia F3 | Clay |  Yannick Vandenbulcke | 1–6, 2–6 |
| Runner-up | 3. | | USA F18 | Clay |  Alex Rybakov | 6–4, 0–6, 1–6 |
| Runner-up | 4. | | USA F4 | Clay | Julien Cagnina | 7–6, 3–6, 3–6 |
