| Giraldilla Int. XD | 2018/04/06 03:00 | Koki Watanabe v Kodai Naraoka | L | 1-2 |
| Giraldilla Int. XD | 2018/12/22 02:00 | Hsu, Jen Hao v Koki Watanabe | W | 1-2 |
| Giraldilla Int. XD | 2018/12/21 02:05 | Koki Watanabe v Kevin Cordon | W | 2-0 |
| Giraldilla Int. XD | 2018/12/19 20:30 | Misha Zilberman v Koki Watanabe | W | 0-2 |
| Giraldilla Int. XD | 2018/12/18 22:30 | Koki Watanabe v Durkinjak, Zvonimir | D | 0-0 |
| Macau Open 2019, MS | 2018/10/31 12:20 | Koki Watanabe v Wong, Wing Ki Vincent | L | 0-2 |
| Giraldilla Int. XD | 2018/07/29 05:18 | Verma, Sourabh v Koki Watanabe | L | 2-1 |
| Giraldilla Int. XD | 2018/07/29 03:30 | Verma, Sourabh v Koki Watanabe | L | 2-1 |
| Giraldilla Int. XD | 2018/07/28 02:40 | Koki Watanabe v Malkov, Vladimir | W | 2-0 |
| Giraldilla Int. XD | 2018/12/22 01:30 | Kodai Naraoka v Igarashi, Yu | W | 2-0 |
| Giraldilla Int. XD | 2018/12/19 21:05 | Kodai Naraoka v Karan Rajan Rajarajan | W | 2-0 |
| Open de Suisse - Doubles Femmes - Qualif. | 2018/08/28 12:25 | Takeshita, Riichi v Kodai Naraoka | L | 2-1 |
| Open de Suisse - Doubles Femmes - Qualif. | 2018/08/28 10:35 | Fabio Caponio v Kodai Naraoka | W | 0-2 |
| Giraldilla Int. XD | 2018/07/25 06:10 | Thammasin, S. v Kodai Naraoka | L | 2-0 |
| Giraldilla Int. XD | 2018/07/24 01:30 | Kodai Naraoka v Pit Seng Low | W | 2-0 |
| Giraldilla Int. XD | 2018/06/21 22:30 | Rouxel, Thomas v Kodai Naraoka | L | 2-1 |
| Giraldilla Int. XD | 2018/06/20 23:50 | Kodai Naraoka v Huang, Y. X. | W | 2-1 |