Stadium: Court 1 Round: 25 Ground: Clay
| ITF M25 Klosters | 2021/06/21 06:50 | Daniel Cukierman v Tanner, Gian Luca | 6-3,6-4 |
| ITF M25 Klosters | 2021/06/20 07:00 | Tanner, Gian Luca v Maik Steiner | 6-4,6-2 |
| ITF - M15 Antalya | 2021/06/07 07:00 | Francisco Comesana v Tanner, Gian Luca | 6-1,6-2 |
| ITF - M15 Antalya | 2021/06/06 07:30 | Tanner, Gian Luca v Caspar Schuetze | 1-6,6-4,10-4 |
| ITF - M15 Antalya | 2021/05/30 07:30 | Antonio Caruso v Tanner, Gian Luca | 6-3,6-4 |
| ITF M15 Troisdorf | 2021/05/11 08:00 | Johnson, Luke v Tanner, Gian Luca | 6-7,7-5,11-9 |
| ITF M15 Troisdorf | 2021/05/10 08:00 | Tanner, Gian Luca v Paul Woerner | 6-4,6-7,10-8 |
| ITF M15 Troisdorf | 2021/05/09 08:00 | Tim Handel v Tanner, Gian Luca | 5-7,2-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/19 08:00 | Hampel, Lenny v Titouan Droguet | 6-2,5-7,2-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/18 11:00 | Hampel, Lenny v Martin Krumich | 6-3,6-4 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 08:30 | Hampel, Lenny v Recek, Dominik | 6-2,7-5 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 11:30 | Hampel, Lenny v Kris Krawcewicz | 7-5,6-2 |
| ITF M25 Prague | 2021/05/11 10:40 | Franco Agamenone v Hampel, Lenny | 6-3,6-3 |
| ITF M25 Prague | 2021/05/10 09:00 | Dominique Graf v Hampel, Lenny | 3-6,4-6 |
| ITF M25 Prague | 2021/05/09 12:30 | Matthew William Donald v Hampel, Lenny | 2-6,6-4,8-10 |
| ITF M15 Bratislava | 2021/03/10 12:05 | Satral, Jan v Hampel, Lenny | 6-4,6-3 |