Stadium: Court 3 Round: 44 Ground: Hardcourt outdoor
| ITF - M15 Héraklion | 2020/02/16 11:00 | Guenther, Valentin v Ng, Hao Yuan | 6-2,6-0 |
| ITF - M15 Héraklion | 2020/02/12 13:10 | Guenther, Valentin v Erler, Alexander | 4-6,6-2,4-6 |
| ITF - M15 Manacor | 2020/01/12 10:00 | Guenther, Valentin v Patzanovsky, Christopher | 4-6,7-5,10-5 |
| ITF - M15 Manacor | 2020/01/09 09:00 | Jonas Forejtek v Guenther, Valentin | 6-2,1-6,6-4 |
| ITF - M15 Manacor | 2020/01/07 10:30 | Valentin Royer v Guenther, Valentin | 3-6,1-6 |
| ITF - M15 Héraklion | 2019/12/03 09:30 | Jakub Paul v Guenther, Valentin | 6-3,6-4 |
| ITF - M15 Héraklion | 2019/11/27 09:30 | Guenther, Valentin v Uisung Park | 3-6,2-6 |
| ITF - M15 Héraklion | 2019/11/26 08:00 | Guenther, Valentin v Khomich, Aleksei | 6-4,5-7,10-8 |
| ITF - M15 Héraklion | 2020/02/16 11:00 | Griffith, William v Knoess, Vincent | 6-1,6-1 |
| Newport Beach, USA | 2020/01/27 18:30 | Velotti, Agustin v Griffith, William | 6-2,6-4 |
| ITF M15 Cancun | 2019/09/15 19:00 | Griffith, William v Astorga, Mauricio | 6-7,3-6 |
| ITF M15 Cancun | 2019/09/15 14:30 | Griffith, William v Stafford, Jabari | 6-0,6-2 |
| Sao Bras Alportel, Singles Q M-ITF-POR-13A | 2019/09/04 12:00 | Griffith, William v Tverijonas, Julius | 4-6,5-7 |
| Sao Bras Alportel, Singles Q M-ITF-POR-13A | 2019/09/03 09:00 | Griffith, William v Martini, Ottaviano | 6-4,6-3 |
| Sao Bras Alportel, Singles Q M-ITF-POR-13A | 2019/09/02 09:00 | Griffith, William v Bajwa, Paramveer Singh | 7-6,6-1 |
| Piombino, Singles M-ITF-ITA-19A | 2019/08/29 12:30 | Griffith, William v Trusendi, Walter | 2-6,4-6 |