Stadium: Court 2 Round: 25 Ground: Clay
| ITF M25 Muttenz | 2021/08/19 10:35 | Luca Castelnuovo v Oscar Jose Gutierrez | 1-6,2-6 |
| ITF M25 Muttenz | 2021/08/18 12:50 | Gabriele Moghini v Luca Castelnuovo | 6-7,1-6 |
| Challenger Tampere | 2021/07/18 10:20 | Kyrian Jacquet v Luca Castelnuovo | 6-7,6-1,6-0 |
| Challenger Amersfoort | 2021/07/11 14:25 | Michael Geerts v Luca Castelnuovo | 7-6,6-2 |
| ITF M15 Poprad | 2021/07/08 08:00 | Luca Castelnuovo v Roman Andres Burruchaga | 2-6,3-6 |
| ITF M15 Poprad | 2021/07/07 10:10 | Luca Castelnuovo v Jan Jermar | 7-6,6-2 |
| ITF M25 Wroclaw | 2021/06/27 15:30 | Luca Castelnuovo v Piotr Grynkowski | 6-4,6-7,7-10 |
| ITF M25 Klosters | 2021/06/23 10:30 | Luca Castelnuovo v Tim Handel | 6-7,2-6 |
| ITF M25 Caslano | 2021/08/25 10:40 | Nicolas Parizzia v Gian Luca Tanner | 2-6,6-2,6-4 |
| ITF M25 Muttenz | 2021/08/18 15:00 | Rinky Hijikata v Gian Luca Tanner | 6-3,6-0 |
| ITF M25 Muttenz | 2021/08/17 12:00 | Gian Luca Tanner v Gabriele Moghini | 6-7,2-6 |
| ITF M25 Muttenz | 2021/08/16 14:20 | Gian Luca Tanner v Fynn Skender | 6-2,6-2 |
| ITF M25 Klosters | 2021/06/22 09:20 | Gian Luca Tanner v Lenny Hampel | 5-7,4-6 |
| ITF M25 Klosters | 2021/06/21 06:50 | Daniel Cukierman v Gian Luca Tanner | 6-3,6-4 |
| ITF M25 Klosters | 2021/06/20 07:00 | Gian Luca Tanner v Maik Steiner | 6-4,6-2 |
| ITF M15 Antalya | 2021/06/07 07:00 | Francisco Comesana v Gian Luca Tanner | 6-1,6-2 |