Stadium: Indoor C5 Round: 54 Ground: Hardcourt outdoor
| ITF M25 - Laval | 2023/07/09 17:10 | Gabrielius Guzauskas v Zachary Mintz | 6-1,6-1 |
| ITF M25 - Tulsa | 2023/06/21 15:30 | Gabrielius Guzauskas v Nick Chappell | 6-7,4-6 |
| ITF M25 - Tulsa | 2023/06/20 14:30 | Mykhailo Kvantaliani v Gabrielius Guzauskas | 6-0,4-6,5-10 |
| ITF M25 - Tulsa | 2023/06/19 13:00 | Yuvraj Rao v Gabrielius Guzauskas | 1-6,1-6 |
| ITF M25 - Wichita | 2023/06/14 15:00 | Ethan Quinn v Gabrielius Guzauskas | 6-2,6-1 |
| ITF M25 - Wichita | 2023/06/13 14:55 | Gabrielius Guzauskas v Matt Hulme | 2-6,6-4,10-6 |
| ITF M25 - Champaign | 2022/07/19 16:30 | Johannus Monday v Gabrielius Guzauskas | 6-3,6-4 |
| ITF M25 - Champaign | 2022/07/18 19:00 | Gabrielius Guzauskas v Chad Miller | 6-0,6-3 |
| ITF M25 - Laval | 2023/07/09 16:35 | Yanael Lundqvist v John Mercer | 1-6,2-6 |
| ITF M15 - East Lansing | 2022/11/16 19:55 | Patrick Fletchall v John Mercer | 6-4,6-4 |
| ITF M25 - East Lansing | 2022/11/15 15:00 | Jeremy Schifris v John Mercer | 6-2,6-1 |
| ITF M25 - East Lansing | 2022/11/13 16:30 | John Mercer v Stefan Menichella | 2-6,6-2,10-3 |
| ITF M15 - Winston-Salem | 2022/11/07 20:30 | Herbert Jody Maginley v John Mercer | 7-5,4-6,10-7 |
| Challenger - Lexington | 2022/07/31 22:20 | John Mercer v Alafia Ayeni | 6-3,2-6,4-6 |
| UTR Pro Tennis Series - Ann Arbor | 2022/07/29 17:00 | Jacob Bickersteth v John Mercer | 6-0,4-6,6-4 |
| UTR Pro Tennis Series - Ann Arbor | 2022/07/27 17:30 | John Mercer v Jacob Perkins | 6-0,6-2 |