Stadium: Court 8 Round: 25 Ground: Clay
| ITF M15 Cairo | 2021/09/16 11:30 | Roncalli, Simone v Eisinga, Zachary | 6-3,6-4 |
| ITF M15 Cairo | 2021/09/15 10:40 | Da Silva, Gabriel Ciro v Eisinga, Zachary | 7-6,4-6,2-6 |
| ITF M15 Huy | 2021/08/25 12:50 | Eisinga, Zachary v Netuschil, Marvin | 4-6,6-7 |
| ITF M15 Oldenzaal | 2021/08/18 14:10 | Schmitz, Constantin v Eisinga, Zachary | 6-3,7-6 |
| ITF M15 Oldenzaal | 2021/08/16 10:00 | Eisinga, Zachary v van Baal, Aloys Johannes Willem | 3-6,6-4,10-7 |
| ITF M15 Oldenzaal | 2021/08/15 07:30 | Eisinga, Zachary v Peters, Flemming | 6-0,6-3 |
| ITF M25 The Hague | 2021/06/27 08:00 | Dax Donders v Eisinga, Zachary | 6-2,7-5 |
| ITF M25 Alkmaar | 2021/06/21 14:25 | Dermiens, Guillaume v Eisinga, Zachary | 4-6,7-5,13-11 |
| ITF M15 Cairo | 2021/09/14 08:15 | Da Silva, Gabriel Ciro v Senthilkumar, Muthu Aadhitiya | 6-2,7-5 |
| ITF M15 Cairo | 2021/09/13 08:00 | Louis Allen v Senthilkumar, Muthu Aadhitiya | 4-6,7-5,8-10 |
| ITF M15 Cairo | 2021/09/12 12:30 | Mazzeo, Antonio v Senthilkumar, Muthu Aadhitiya | 5-7,6-3,7-10 |
| ITF M15 New Delhi | 2021/03/31 10:30 | Senthilkumar, Muthu Aadhitiya v Zsombor Velcz | 4-6,1-6 |
| ITF M15 New Delhi | 2021/03/30 05:30 | Qamar, Faisal v Senthilkumar, Muthu Aadhitiya | 1-6,3-6 |
| ITF M15 New Delhi | 2021/03/28 12:15 | Yash Chaurasia v Senthilkumar, Muthu Aadhitiya | 3-6,4-6 |
| ITF M15 New Delhi | 2021/03/28 06:30 | Dahiya, Jatin v Senthilkumar, Muthu Aadhitiya | 2-6,6-7 |
| ITF M15 Pune | 2021/03/22 04:30 | Senthilkumar, Muthu Aadhitiya v R Prabodh, Suraj | 2-6,2-6 |