Stadium: Court 3 Round: 62 Ground: Hardcourt outdoor
| ITF - M15 Sharm-el-Sheikh | 2021/02/08 07:30 | Karlo Cubelic v Lukas Krainer | 4-6,4-6 |
| ITF - M15 Sharm-el-Sheikh | 2021/02/07 07:00 | Luca Moro Almeida v Karlo Cubelic | 0-6,0-6 |
| ITF - M15 Sharm-el-Sheikh | 2021/01/31 07:00 | Karlo Cubelic v Lukas Palovic | 6-3,3-6,1-10 |
| ITF M15 - Bressuire | 2021/01/17 11:05 | Karlo Cubelic v Tom Schonenberg | 4-6,4-6 |
| German Championship | 2020/12/07 16:30 | Karlo Cubelic v Hendrik Jebens | 3-6,6-7 |
| ITF M15 - Sarreguemines | 2020/10/28 08:55 | Karlo Cubelic v Sandro Ehrat | 2-6,4-6 |
| ITF M15 - Sarreguemines | 2020/10/26 15:35 | Kai Lemstra v Karlo Cubelic | 4-6,7-5,8-10 |
| ITF M15 - Sarreguemines | 2020/10/25 16:20 | Karlo Cubelic v Adil Kalyanpur | 6-2,6-3 |
| ITF - M15 Sharm-el-Sheikh | 2021/02/07 14:30 | Daisuke Sumizawa v Nitin Kumar Sinha | 6-3,7-6 |
| ITF - M15 Sharm-el-Sheikh | 2021/02/02 10:50 | Daisuke Sumizawa v Nitin Kumar Sinha | 6-3,6-3 |
| ITF - M15 Sharm-el-Sheikh | 2021/02/01 08:00 | Nitin Kumar Sinha v Bastien Presuhn | 6-1,7-5 |
| ITF - M15 Sharm-el-Sheikh | 2021/01/31 09:00 | Anirudh Chandrasekar v Nitin Kumar Sinha | 3-6,4-6 |
| ITF M15 Kolkata | 2020/03/12 04:00 | Niklas Schell v Nitin Kumar Sinha | 6-3,3-6,0-6 |
| ITF M25 - Nonthaburi | 2020/02/03 04:55 | Nitin Kumar Sinha v Austin Rapp | 1-6,6-3,8-10 |
| ITF M25 - Nonthaburi | 2020/02/02 09:45 | Nitin Kumar Sinha v Shisanuphong Pokinsagethasiri | 6-3,2-6,13-11 |
| ITF - M15 Antalya | 2020/01/29 06:00 | Nitin Kumar Sinha v Tristan Meraut | 2-6,6-7 |