Stadium: Court 11 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Naples | 2023/02/20 14:30 | Lucas Bouquet v Leo Vithoontien | 6-2,6-0 |
| ITF M15 Palm Coast | 2023/02/06 15:00 | Jakub Wojcik v Leo Vithoontien | 6-4,4-6,10-0 |
| ITF M25 Wesley Chapel | 2023/01/25 18:35 | Leo Vithoontien v Jaimee Floyd Angele | 3-6,4-6 |
| ITF M25 Wesley Chapel | 2023/01/24 15:45 | Aleksa Ciric v Leo Vithoontien | 6-7,6-7 |
| ITF M25 Wesley Chapel | 2023/01/23 14:45 | Xavier Lawrence v Leo Vithoontien | 2-6,6-2,8-10 |
| ITF M15 Ithaca | 2023/01/16 18:30 | Jack McCarthy v Leo Vithoontien | 3-6,6-4,10-4 |
| ITF M15 Winston-Salem | 2022/11/08 17:30 | Christian Lakoseljac v Leo Vithoontien | 6-3,6-4 |
| ITF M15 Winston-Salem | 2022/11/07 18:00 | Jared Thompkins v Leo Vithoontien | 6-7,3-6 |
| ITF M25 Palmanova | 2023/03/20 14:00 | Lazar Markovic v Peetu Pohjola | 6-7,1-6 |
| ITF M25 Palmanova | 2023/03/12 12:00 | Lazar Markovic v Marcel Politowicz | 5-7,2-6 |
| ITF M15 Jakarta Qual | 2023/01/22 02:30 | Sam Ryan Ziegann v Lazar Markovic | 6-1,6-4 |
| ITF M15 Jakarta | 2023/01/15 05:20 | Ega Uneputty v Lazar Markovic | 6-4,1-6,10-3 |
| ITF M15 Monastir | 2022/12/19 11:00 | Lazar Markovic v Alexander Orlov | 3-6,2-6 |
| ITF M15 Monastir | 2022/12/18 10:00 | Lazar Markovic v Christopher Chien | 6-4,6-3 |
| ITF M15 Antalya | 2022/12/11 11:30 | Lazar Markovic v Stefano Papagno | 3-6,0-6 |
| ITF M15 Antalya | 2022/12/05 10:05 | Lazar Markovic v Valerio Perruzza | 1-6,0-6 |