Stadium: Court 4 Round: 45 Ground: Hardcourt outdoor
| ITF - Sharm El Sheikh M15 | 2019/03/04 08:00 | George Tsivadze v Kai Lemstra | 2-6,6-4,10-3 |
| ITF M15 Kaarst | 2019/02/06 11:00 | Kai Lemstra v Mats Rosenkranz | 6-7,6-2,4-6 |
| ITF M15 Kaarst | 2019/02/04 20:45 | Tim Heger v Kai Lemstra | 6-4,3-6,9-11 |
| Challenger Koblenz | 2019/01/15 09:00 | Peter Torebko v Kai Lemstra | 6-1,1-6,6-1 |
| ITF - Monastir M15 | 2019/01/10 10:00 | Kai Lemstra v Jonathan Mridha | 1-6,6-3,2-6 |
| ITF - Monastir M15 | 2019/01/09 11:45 | Christian Seraphim v Kai Lemstra | 4-6,4-6 |
| ITF Czech Republic F12 | 2018/11/27 09:00 | Remy Bertola v Kai Lemstra | 6-4,6-3 |
| ITF Czech Republic F12 | 2018/11/26 09:00 | David Juras v Kai Lemstra | 6-4,3-6,6-7 |
| ITF - Monastir M15 | 2019/02/14 11:05 | Kristjan Tamm v Alvaro Lopez San Martin | 1-6,3-6 |
| ITF - Monastir M15 | 2019/02/13 11:45 | Ondrej Styler v Kristjan Tamm | 4-6,3-6 |
| ITF - Monastir M15 | 2019/02/11 13:30 | Kristjan Tamm v Vasko Mladenov | 6-3,6-3 |
| ITF - Monastir M15 | 2019/02/11 08:00 | Alexis Canter v Kristjan Tamm | 6-1,4-6,7-10 |
| ITF - Monastir M15 | 2019/02/04 10:00 | Brian Bencic v Kristjan Tamm | 6-7,7-5,10-4 |
| ITF Tunisia F44 | 2018/12/10 08:30 | Yan Bondarevskiy v Kristjan Tamm | 6-3,6-1 |
| ITF Tunisia F44 | 2018/12/08 08:00 | Vitalii Shcherba v Kristjan Tamm | 0-6,3-6 |
| ITF Tunisia F43 | 2018/12/06 08:00 | Kristjan Tamm v Evan Hoyt | 3-6,2-6 |