Stadium: Court 1 Round: 26 Ground: Clay
| Challenger Zadar | 2021/03/22 13:15 | Frane Nincevic v Mili Poljicak | 4-6,6-4,6-3 |
| ITF M15 Rovinj | 2021/03/17 09:00 | Timo Legout v Frane Nincevic | 6-0,7-6 |
| ITF M15 Rovinj | 2021/03/16 12:55 | Frane Nincevic v Gian Marco Ortenzi | 6-1,6-4 |
| ITF M15 Rovinj | 2021/03/15 13:30 | Louis Tessa v Frane Nincevic | 4-6,6-4,8-10 |
| ITF M15 Rovinj | 2021/03/15 09:30 | Tim Heger v Frane Nincevic | 6-7,4-6 |
| ITF M15 Porec | 2021/03/07 13:00 | Yair Sarouk v Frane Nincevic | 6-4,6-2 |
| ITF M15 Manacor | 2021/01/10 11:00 | Arthur Reymond v Frane Nincevic | 6-3,6-3 |
| ITF M15 Manacor | 2021/01/06 13:00 | Frane Nincevic v Marc Othman Ktiri | 3-6,4-6 |
| Challenger Zadar | 2021/03/23 11:30 | Nino Serdarusic v Sumit Nagal | 6-7,4-6 |
| ATP Buenos Aires | 2021/03/05 16:00 | Albert Ramos-Vinolas v Sumit Nagal | 4-6,6-2,7-5 |
| ATP Buenos Aires | 2021/03/03 23:20 | Sumit Nagal v Cristian Garin | 6-4,6-3 |
| ATP Buenos Aires | 2021/03/02 16:10 | Joao Sousa v Sumit Nagal | 2-6,0-6 |
| ATP Buenos Aires | 2021/03/01 16:00 | Sumit Nagal v Nicolas Kicker | 2-6,6-2,6-3 |
| ATP Buenos Aires | 2021/02/28 21:00 | Sumit Nagal v Mario Vilella Martinez | 6-4,6-2 |
| ATP Buenos Aires | 2021/02/27 13:00 | Carlos Gomez-Herrera v Sumit Nagal | 6-7,6-2,6-7 |
| ATP Cordoba | 2021/02/20 13:00 | Sumit Nagal v Facundo Diaz Acosta | 4-6,6-2,3-6 |