Stadium: Court 4 Round: 14 Ground: Clay
| Challenger - Zadar | 2021/03/24 09:00 | Nincevic, Frane v Sumit Nagal | 0-6,1-6 |
| Challenger - Zadar | 2021/03/22 13:15 | Nincevic, Frane v Mili Poljicak | 4-6,6-4,6-3 |
| ITF - M15 Rovinj | 2021/03/17 09:00 | Timo Legout v Nincevic, Frane | 6-0,7-6 |
| ITF - M15 Rovinj | 2021/03/16 12:55 | Nincevic, Frane v Gian Marco Ortenzi | 6-1,6-4 |
| ITF - M15 Rovinj | 2021/03/15 13:30 | Louis Tessa v Nincevic, Frane | 4-6,6-4,8-10 |
| ITF - M15 Rovinj | 2021/03/15 09:30 | Heger, Tim v Nincevic, Frane | 6-7,4-6 |
| ITF - M15 Porec | 2021/03/07 13:00 | Sarouk, Yair v Nincevic, Frane | 6-4,6-2 |
| ITF - M15 Manacor | 2021/01/10 11:00 | Arthur Reymond v Nincevic, Frane | 6-3,6-3 |
| Challenger - Oeiras | 2021/04/06 10:35 | Cacao, Tiago v Tristan Lamasine | 6-2,6-4 |
| Challenger - Lille | 2021/03/25 13:25 | Tristan Lamasine v Benjamin Bonzi | 4-6,3-6 |
| Challenger - Lille | 2021/03/23 13:00 | Tristan Lamasine v Briand, Jurgen | 4-6,6-3,6-4 |
| Challenger Biella Qual | 2021/03/14 11:05 | Tristan Lamasine v Vanni, Luca | 4-6,4-6 |
| Challenger Biella | 2021/03/11 13:50 | Tristan Lamasine v Seppi, Andreas | 6-1,1-6,6-7 |
| Challenger Biella | 2021/03/09 09:00 | Hugo Grenier v Tristan Lamasine | 4-6,2-6 |
| Challenger Potchefstroom | 2021/02/17 10:30 | Dimitar Kuzmanov v Tristan Lamasine | 7-5,7-6 |
| Challenger Potchefstroom | 2021/02/15 12:25 | Quiroz, Roberto v Tristan Lamasine | 5-7,5-7 |