Stadium: Court 8 Round: 62 Ground: Clay
| ITF M15 Cairo | 2021/01/17 07:00 | Sunish, Dhruv v Krainer, L. | 3-6,3-6 |
| ITF M25 Prague | 2020/09/13 08:00 | Krainer, L. v Paroulek, Tadeas | 4-6,6-1,8-10 |
| ITF M15 Anif | 2020/08/23 12:00 | Alexander Shevchenko v Krainer, L. | 6-2,6-7,11-9 |
| ITF M15 Anif | 2020/08/23 07:00 | Krainer, L. v Tim Handel | 6-3,6-4 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/19 11:40 | Krainer, L. v Nino Serdarusic | 3-6,3-6 |
| Austrian OTV Series | 2020/07/30 09:30 | David Pichler v Krainer, L. | 6-3,2-6,4-6 |
| Austrian Tennis Championship | 2020/07/29 14:40 | Sandro Kopp v Krainer, L. | 6-4,6-4 |
| Austrian Tennis Championship | 2020/07/28 14:05 | Hampel, Lenny v Krainer, L. | 7-6,4-6,6-3 |
| ITF M15 Cairo | 2021/01/17 07:00 | Sergi Perez Contri v Granollers, Gerard | 6-2,6-3 |
| ITF M15 Cairo | 2021/01/13 08:30 | Filip Cristian Jianu v Sergi Perez Contri | 6-4,7-5 |
| ITF M15 Cairo | 2021/01/11 12:00 | Alejo Lorenzo Lingua Lavallen v Sergi Perez Contri | 5-7,3-6 |
| ITF M15 Cairo | 2021/01/11 08:00 | Constantin Bittoun Kouzmine v Sergi Perez Contri | 1-6,2-6 |
| ITF M15 Cairo | 2021/01/10 09:30 | Dylan Salton v Sergi Perez Contri | 1-6,4-6 |
| ITF M15 Cairo | 2021/01/07 08:00 | Sergi Perez Contri v Edoardo Lavagno | 6-1,6-7,5-7 |
| ITF M15 Cairo | 2021/01/06 09:20 | Gaber, Adham v Sergi Perez Contri | 1-6,1-6 |
| ITF M15 Cairo | 2021/01/04 12:30 | Sergi Perez Contri v Leonardo Catani | 6-2,6-2 |