Stadium: Lotto RLP Centre Court Round: 166 Ground: Hardcourt indoor
| ITF - Naples M25 | 2020/02/13 15:00 | Eduard Esteve Lobato v Lucas Gerch | 7-6,4-6,7-5 |
| ITF - Naples M25 | 2020/02/11 16:25 | Lucas Gerch v Javier Barranco Cosano | 7-5,6-3 |
| ITF - Palm Coast M25 | 2020/02/06 16:55 | Gianluigi Quinzi v Lucas Gerch | 3-6,7-6,6-1 |
| ITF - Palm Coast M25 | 2020/02/05 19:00 | Lucas Gerch v Nick Hardt | 4-6,6-1,6-3 |
| ITF - Weston M25 | 2020/01/29 15:55 | Lucas Gerch v Manuel Pena Lopez | 5-7,5-7 |
| ITF - Rancho Santa Fe M25 | 2020/01/14 17:30 | Lucas Gerch v Alex Rybakov | 4-6,6-7 |
| ITF - Rancho Santa Fe M25 | 2020/01/13 18:00 | Lucas Gerch v Abraham Asaba | 6-4,6-0 |
| Challenger Ann Arbor | 2020/01/09 18:20 | JC Aragone v Lucas Gerch | 3-6,6-4,6-4 |
| ITF - Nussloch M25 | 2020/01/20 09:00 | Robin Stanek v Johann Willems | 7-5,6-0 |
| ITF - Nussloch M25 | 2020/01/19 09:00 | Flemming Peters v Johann Willems | 2-6,0-6 |
| ITF M15 Bad Salzdetfurth | 2019/10/08 11:00 | Jeremy Schifris v Johann Willems | 3-6,6-3,10-3 |
| ITF M15 Bad Salzdetfurth | 2019/10/07 09:10 | Johann Willems v Laurin Aerne | 6-3,6-3 |
| ITF Germany F16 | 2018/10/23 13:00 | Stefan Seifert v Johann Willems | 4-6,6-3,6-2 |
| ITF Germany F16 | 2018/10/22 10:00 | Johann Willems v Karlo Cubelic | 6-3,6-4 |
| ITF Germany F16 | 2018/10/21 10:30 | Johann Willems v Herman Meeuwes Mattheo Knoop | 6-4,6-3 |
| ITF Germany F5 | 2018/06/28 14:15 | Markus Eriksson v Johann Willems | 6-3,6-0 |