Stadium: Court 6 Round: 25 Ground: Clay
| ITF M15 Vejle | 2021/07/29 14:35 | Henrik Heise Korsgaard v Christian Sigsgaard | 7-5,6-2 |
| ITF M15 Vejle | 2021/07/28 12:50 | Christian Sigsgaard v Ryan Nijboer | 6-3,6-2 |
| ITF M15 Heraklion | 2021/05/31 06:30 | Christian Sigsgaard v Sean Hodkin | 2-6,7-5,6-10 |
| ITF M15 Heraklion | 2021/05/30 09:00 | Matic Dimic v Christian Sigsgaard | 3-6,2-6 |
| ITF M15 Tbilisi | 2021/05/22 06:00 | Christian Sigsgaard v Alexander Shevchenko | 6-7,6-7 |
| ITF M15 Tbilisi | 2021/05/21 06:00 | Christian Sigsgaard v Benjamin Lock | 7-5,6-1 |
| ITF M15 Tbilisi | 2021/05/20 06:00 | Christian Sigsgaard v Yurii Dzhavakian | 6-2,6-4 |
| ITF M15 Tbilisi | 2021/05/19 07:25 | Sanjar Fayziev v Christian Sigsgaard | 4-6,3-6 |
| ITF M15 Vejle | 2021/07/28 08:00 | Giorgio Ricca v Carl Emil Overbeck | 3-6,4-6 |
| ITF M15 Perugia | 2021/07/18 10:15 | Giorgio Ricca v Alessandro Pecci | 4-6,2-6 |
| ITF M15 L'Aquila | 2021/07/14 13:10 | Alexander Weis v Giorgio Ricca | 6-7,7-6,6-4 |
| ITF M15 Genova | 2021/06/16 15:00 | Giorgio Ricca v Giovanni Fonio | 6-4,3-6,1-6 |
| ITF M15 Genova | 2021/06/15 09:00 | Giorgio Ricca v Marco Miceli | 6-4,7-6 |
| ITF M15 Gaiba | 2021/06/10 08:55 | Mats Rosenkranz v Giorgio Ricca | 7-6,4-6,6-3 |
| ITF M15 Gaiba | 2021/06/09 08:30 | Robert Strombachs v Giorgio Ricca | 2-6,1-6 |
| ITF M15 Gaiba | 2021/06/08 11:20 | Giorgio Ricca v Yannik Steinegger | 6-3,5-7,10-7 |