| Davis Cup | 10/17 06:15 | 1 | Essa Qabazard v Derek Okuhama | 6-2,6-2 | |
| ITF M25 Harmon | 05/30 01:55 | 54 | Mao Takada v Derek Okuhama | 6-1,6-3 | |
| Davis Cup | 10/23 06:15 | - | Namazbek Diushembiev v Derek Okuhama | 0-6,6-7 | |
| Davis Cup | 09/13 07:00 | - | Abedallah Shelbayh v Derek Okuhama | 6-1,6-2 | |
| ITF Guam F1 | 06/18 01:20 | 25 | Yuta Shimizu v Derek Okuhama | 6-0,6-0 | |
| ITF Guam F1 | 06/17 01:00 | 54 | Alex Brenner v Derek Okuhama | 6-1,6-0 | |
| ITF Guam F1 | 06/17 00:00 | 54 | Masayoshi Ono v Derek Okuhama | 6-0,6-1 | |
| ITF Guam F1 | 05/21 00:00 | 54 | Steven Goh v Derek Okuhama | 6-0,6-0 |