Stadium: Center Court Round: 25 Ground: Hardcourt outdoor
| Challenger Amersfoort | 2019/07/17 08:00 | Nicola Kuhn v Ivan Gakhov | 5-7,6-4,3-6 |
| Braunchsweig, Germany | 2019/07/08 11:00 | Nicola Kuhn v Moraing, Mats | 3-6,6-2,5-7 |
| Ludwigshafen, Allemagne | 2019/07/03 13:00 | Nicola Kuhn v Martin, Andrej | 5-7,6-4,3-6 |
| Ludwigshafen, Allemagne | 2019/07/02 16:00 | Quinzi, Gianluigi v Nicola Kuhn | 6-3,6-7,3-6 |
| Shymkent II, Kazakhstan | 2019/06/14 05:00 | Nicola Kuhn v Stefano Travaglia | 2-6,2-6 |
| Shymkent II, Kazakhstan | 2019/06/13 05:50 | Riccardo Bonadio v Nicola Kuhn | 6-4,4-6,4-6 |
| Shymkent II, Kazakhstan | 2019/06/11 08:15 | Nicola Kuhn v Akira Santillan | 1-6,7-5,6-3 |
| Shymkent II, Kazakhstan | 2019/06/10 06:30 | Roman Safiullin v Nicola Kuhn | 6-3,2-6,2-6 |
| Segovia, Spain | 2019/07/29 14:00 | Barrientos, Nicolas v Dan Added | 6-4,7-5 |
| Nur Sultan, Kazakhstan | 2019/07/15 06:45 | Gastao Elias v Barrientos, Nicolas | 6-1,6-1 |
| Challenger Blois | 2019/06/17 16:40 | Holger Rune v Barrientos, Nicolas | 6-1,3-6,6-3 |
| Anning, China | 2019/04/16 02:00 | Ignatik, Uladzimir v Barrientos, Nicolas | 6-2,6-2 |
| Puerto Vallarta, Mexico | 2018/04/30 22:00 | Barrientos, Nicolas v Ugo Humbert | 6-7,2-6 |
| Challenger Leon Qual | 2018/04/21 15:00 | Ward, James v Barrientos, Nicolas | 6-1,7-6 |
| Challenger Guadalajara Qual | 2018/04/14 15:00 | Griekspoor, Scott v Barrientos, Nicolas | 6-4,7-6 |
| Challenger Mexico City Qual | 2018/04/07 18:00 | Hernandez-Fernandez, Jose v Barrientos, Nicolas | 6-2,6-3 |