Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF M25 East Lansing | 2024/07/15 16:00 | Gabrielius Guzauskas v Cameron Muller | 6-0,6-0 |
| ITF M25 Tulsa | 2024/06/19 14:00 | Gabrielius Guzauskas v Elio Jose Ribeiro Lago | 6-7,4-6 |
| ITF M25 Tulsa | 2024/06/18 13:55 | Eric Perkowski v Gabrielius Guzauskas | 3-6,0-6 |
| ITF M25 Wichita | 2024/06/11 15:00 | Alexander Kotzen v Gabrielius Guzauskas | 6-4,6-0 |
| ITF M25 Wichita | 2024/06/10 17:00 | Gabrielius Guzauskas v Ritesh Patil | 6-2,6-2 |
| ITF M25 Wichita | 2024/06/10 14:00 | Anirudh Rao v Gabrielius Guzauskas | 1-6,1-6 |
| ITF M15 Kingston | 2024/05/24 16:40 | Gabrielius Guzauskas v Leo Borg | 6-7,3-6 |
| ITF M15 Kingston | 2024/05/23 19:10 | Gabrielius Guzauskas v Aristotelis Thanos | 2-6,6-3,6-4 |
| ITF M15 Kingston | 2024/05/28 18:45 | Reece Falck v Joshua Portnoy | 6-3,6-3 |
| ITF M15 Kingston | 2024/05/27 15:00 | Shu Matsuoka v Joshua Portnoy | 6-3,4-6,5-10 |
| ITF M15 East Lansing | 2023/11/13 17:00 | Joshua Portnoy v Esunge Ndumbe | 6-2,6-1 |
| UTR Pro Columbus | 2023/08/19 19:36 | Chad Miller v Joshua Portnoy | 6-4,6-2 |
| UTR Pro Columbus | 2023/08/18 18:30 | Brandon Carpico v Joshua Portnoy | 6-4,7-6 |
| UTR Pro Columbus | 2023/08/17 16:05 | Alex Fuchs v Joshua Portnoy | 5-7,6-7 |
| UTR Pro Columbus | 2023/08/16 14:00 | Presley Thieneman v Joshua Portnoy | 6-4,6-1 |
| UTR Pro Columbus | 2023/08/14 14:00 | Jack Anthrop v Joshua Portnoy | 6-3,6-2 |