Stadium: Court 1 Round: 24 Ground: Clay
| Challenger Drummondville | 2019/03/12 23:55 | Thai-Son Kwiatkowski v Jeffrey John Wolf | 1-6,2-6 |
| Challenger Indian Wells | 2019/02/25 19:30 | Thai-Son Kwiatkowski v Donald Young | 6-4,1-6,6-7 |
| Challenger Morelos | 2019/02/20 16:00 | Gonzalo Escobar v Thai-Son Kwiatkowski | 5-7,6-4,6-2 |
| Challenger Dallas | 2019/02/06 02:00 | Thai-Son Kwiatkowski v Thomaz Bellucci | 4-6,7-5,5-7 |
| Challenger Dallas | 2019/02/05 01:00 | Jelle Sels v Thai-Son Kwiatkowski | 6-4,6-7,4-6 |
| Challenger Newport Beach | 2019/01/22 18:00 | Thai-Son Kwiatkowski v Victor Estrella Burgos | 3-6,4-6 |
| Challenger Da Nang | 2019/01/11 06:00 | Thai-Son Kwiatkowski v Matteo Viola | 7-5,6-7,2-6 |
| Challenger Da Nang | 2019/01/10 06:00 | Tsung-Hua Yang v Thai-Son Kwiatkowski | 4-6,6-7 |
| Challenger Bergamo | 2019/02/18 13:15 | Carlos Taberner v Scott Griekspoor | 7-6,6-3 |
| ATP Rotterdam | 2019/02/09 11:50 | Marius Copil v Scott Griekspoor | 6-7,7-6,7-6 |
| Challenger Budapest | 2019/02/05 14:40 | Nikola Milojevic v Scott Griekspoor | 6-4,6-7,6-4 |
| Challenger Budapest | 2019/02/04 15:30 | Daniel Masur v Scott Griekspoor | 2-6,6-3,4-6 |
| Challenger Koblenz | 2019/01/15 20:15 | Zsombor Piros v Scott Griekspoor | 4-6,6-0,6-2 |
| Challenger Columbus | 2019/01/12 20:40 | Scott Griekspoor v Jeffrey John Wolf | 1-6,3-6 |
| Challenger Columbus | 2019/01/11 20:40 | Scott Griekspoor v Uladzimir Ignatik | 7-6,3-6,6-3 |
| Challenger Columbus | 2019/01/10 16:00 | Santiago Giraldo v Scott Griekspoor | 1-6,4-6 |