Stadium: Hard 2 Round: 25 Ground: Hardcourt outdoor
| Bolton, Qualifications Simples M-ITF-GBR-03A | 2019/04/01 08:00 | Farmer, Elliott v Guenther, Valentin | 6-3,7-5 |
| ITF - M15 Poitiers | 2019/03/11 16:35 | Faivre, Pierre v Guenther, Valentin | 6-1,6-2 |
| ITF - M15 Poitiers | 2019/03/11 13:05 | Emilien Voisin v Guenther, Valentin | 1-6,6-7 |
| Oslo, Singles M-ITF-NOR-01A | 2019/03/05 09:00 | Guenther, Valentin v Mayer, Patrick | 1-6,6-3,9-11 |
| ITF - M15 Monastir | 2019/02/07 08:00 | Jacopo Berrettini v Guenther, Valentin | 5-7,7-5,7-5 |
| ITF - M15 Monastir | 2019/02/06 13:40 | Guenther, Valentin v Mohanty, Arnav | 6-4,6-0 |
| ITF - M15 Monastir | 2019/01/31 11:40 | Corentin Denolly v Guenther, Valentin | 6-3,6-4 |
| ITF - M15 Monastir | 2019/01/30 09:00 | Ivanov, Simon Anthony v Guenther, Valentin | 5-7,6-1,2-6 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/29 01:40 | Addison, Aaron v Bourchier, Harry | 7-6,5-7,3-6 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/27 23:00 | Purcell, Rhett v Addison, Aaron | 6-7,1-6 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/27 00:40 | Takeda, Naoki v Addison, Aaron | 3-6,4-6 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/21 23:00 | Christopher O'Connell v Addison, Aaron | 7-6,6-4 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/21 00:40 | Addison, Aaron v Frawley, James | 7-6,6-4 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/19 23:00 | Addison, Aaron v Holt-Crossman, Erik | 6-3,6-2 |
| ITF - M25 Mildura | 2019/03/05 23:00 | Issei Okamura v Addison, Aaron | 7-5,6-2 |
| ITF - M25 Mildura | 2019/03/04 23:00 | Addison, Aaron v Sookton-Eng, Chanchai | 6-1,6-2 |