Ground: Hardcourt outdoor
| ITF - Japão F1 | 2015/03/10 03:50 | Katsuki Nagao v Duckhee Lee | 2-6,3-6 |
| ITF - Turquia F32 | 2014/09/18 08:30 | Katsuki Nagao v Duckhee Lee | 6-4,2-6,3-6 |
| ITF - Japão F3 | 2014/03/26 01:00 | Duckhee Lee v Katsuki Nagao | 6-0,6-7,7-6 |
| ITF - Japão F2 | 2015/03/17 01:00 | Duckhee Lee v Gengo Kikuchi | 6-2,3-6,6-3 |
| ITF - Japão F1 | 2015/03/14 02:00 | Duckhee Lee v Yuya Kibi | 6-3,4-6,5-7 |
| ITF - Japão F1 | 2015/03/13 03:55 | Gengo Kikuchi v Duckhee Lee | 6-7,0-6 |
| ITF - Japão F1 | 2015/03/10 03:50 | Katsuki Nagao v Duckhee Lee | 2-6,3-6 |
| ITF - Turquia F2 | 2015/01/17 11:00 | Jose Pereira v Duckhee Lee | 2-6,7-6,10-3 |
| ITF - Turquia F2 | 2015/01/17 07:00 | Duckhee Lee v Zhe Li | 6-2,6-2 |
| ITF - Turquia F2 | 2015/01/15 10:00 | Mike Urbanija v Duckhee Lee | 3-6,1-6 |
| ITF - Turquia F1 | 2015/01/06 08:00 | Jose Pereira v Duckhee Lee | 6-3,7-6 |
| ITF - Japão F2 | 2015/03/16 01:00 | Chih-Jen Ho v Katsuki Nagao | 4-6,4-6 |
| ITF - Japão F1 | 2015/03/10 03:50 | Katsuki Nagao v Duckhee Lee | 2-6,3-6 |
| ITF - Turquia F34 | 2014/10/01 08:35 | Marshall Tutu v Katsuki Nagao | 6-3,6-1 |
| ITF - Turquia F34 | 2014/09/29 07:00 | Katsuki Nagao v Yvo Panak | 6-3,6-0 |
| ITF - Turquia F34 | 2014/09/28 07:00 | Katsuki Nagao v Keisuke Watanuki | 6-3,5-7,7-6 |
| ITF - Turquia F33 | 2014/09/25 09:40 | Ramkumar Ramanathan v Katsuki Nagao | 6-2,7-5 |
| ITF - Turquia F33 | 2014/09/24 07:00 | Issam Haitham Taweel v Katsuki Nagao | 3-6,3-6 |
| ITF - Turquia F33 | 2014/09/22 07:00 | Katsuki Nagao v Soichiro Moritani | 6-4,6-2 |