Stadium: Court 1 Round: 26 Ground: Clay
| ITF M25 - Anseong | 2023/06/21 03:50 | Gerard Campana Lee v Kokoro Isomura | 6-4,6-3 |
| Challenger Skopje | 2023/05/25 09:45 | Gerard Campana Lee v Evgeny Donskoy | 4-6,2-6 |
| Challenger Skopje | 2023/05/24 09:00 | Nerman Fatic v Gerard Campana Lee | 6-7,6-4,2-6 |
| Challenger Skopje | 2023/05/22 14:10 | Gerard Campana Lee v Daniel Dutra Da Silva | 6-3,6-2 |
| Challenger Oeiras | 2023/05/17 12:45 | Aleksandar Vukic v Gerard Campana Lee | 6-4,4-6,6-3 |
| Challenger Oeiras | 2023/05/16 12:35 | Gerard Campana Lee v Manuel Guinard | 6-3,6-2 |
| ITF M25 - Valldoreix | 2023/05/07 11:30 | Anthony Genov v Gerard Campana Lee | 6-2,6-3 |
| ITF M25 - Sabadell | 2023/05/03 08:00 | Henrique Rocha v Gerard Campana Lee | 6-3,6-1 |
| ITF M25 - Anseong | 2023/06/21 03:40 | Hiroki Sakagawa v Duckhee Lee | 1-6,2-6 |
| ITF M25 - Changwon | 2023/06/15 01:25 | Makoto Ochi v Duckhee Lee | 6-0,4-6,6-2 |
| ITF M25 - Daegu | 2023/06/06 03:10 | Duckhee Lee v Jumpei Yamasaki | 1-6,6-4,4-6 |
| ITF M25 - Jakarta | 2023/06/01 03:55 | Fitriadi M Rifqi v Duckhee Lee | 6-0,3-6,6-1 |
| Challenger Busan | 2023/05/07 05:05 | Duckhee Lee v Hiroki Moriya | 6-7,0-6 |
| Challenger Seoul | 2023/04/26 05:10 | James Duckworth v Duckhee Lee | 7-6,1-6,6-1 |
| Challenger Seoul | 2023/04/24 05:05 | Luke Saville v Duckhee Lee | 3-6,3-6 |
| Challenger Seoul | 2023/04/23 06:00 | Duckhee Lee v Jason Jung | 7-6,6-4 |