Stadium: Court 2 Round: 26 Ground: Hardcourt indoor
| ITF Sweden F5 | 2018/10/01 13:45 | Lucas Catarina v Hong Kit Wong | 7-6,7-5 |
| ITF Sweden F4 | 2018/09/26 13:45 | Yanais Laurent v Lucas Catarina | 6-3,6-2 |
| ITF Sweden F4 | 2018/09/24 12:20 | Marius Ruzgas v Lucas Catarina | 6-7,2-6 |
| ITF Korea F6 | 2018/08/31 06:00 | Lucas Catarina v Yeongseok Jeong | 3-6,6-2,6-2 |
| ITF Korea F6 | 2018/08/30 05:50 | Lucas Catarina v Dylan Seong Kwan Kim | 6-2,6-4 |
| ITF Korea F6 | 2018/08/29 04:40 | Lucas Catarina v Daniel Yoo | 6-2,7-6 |
| ITF Korea F5 | 2018/08/22 03:00 | Chan-Yeong Oh v Lucas Catarina | 4-6,6-2,6-1 |
| ITF Korea F5 | 2018/08/21 03:00 | Jung Hoon Kim v Lucas Catarina | 0-6,2-6 |
| ITF Sweden F5 | 2018/10/02 12:00 | Johannes Haerteis v Antoine Bellier | 6-4,6-2 |
| ITF Sweden F4 | 2018/09/27 11:00 | Christopher Heyman v Johannes Haerteis | 6-3,4-6,6-4 |
| ITF Sweden F4 | 2018/09/24 11:00 | Johannes Haerteis v Fred Simonsson | 6-3,6-2 |
| Challenger Sibiu | 2018/09/16 10:35 | Johannes Haerteis v Julian Lenz | 4-6,4-6 |
| Challenger Sibiu | 2018/09/15 07:30 | Vit Kopriva v Johannes Haerteis | 4-6,1-6 |
| ITF Romania F13 | 2018/09/13 06:30 | Johannes Haerteis v Gabriel Alejandro Hidalgo | 4-6,5-7 |
| ITF Romania F13 | 2018/09/11 06:30 | Johannes Haerteis v Gabi Adrian Boitan | 6-3,6-2 |
| ITF Germany F13 | 2018/08/23 08:00 | Peter Heller v Johannes Haerteis | 6-1,6-0 |