Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| Challenger Zhangjiagang | 2019/03/18 03:55 | Maverick Banes v Daniel Nguyen | 4-6,3-6 |
| Challenger Yokohama | 2019/02/26 03:30 | Yuichi Sugita v Daniel Nguyen | 2-6,6-4,7-5 |
| Challenger Yokohama | 2019/02/25 04:10 | Blake Ellis v Daniel Nguyen | 6-3,5-7,5-7 |
| Challenger Morelos | 2019/02/18 21:15 | Gerardo L Villasenor v Daniel Nguyen | 6-3,6-3 |
| Challenger Chennai | 2019/02/04 04:30 | Daniel Nguyen v Daniel Altmaier | 3-6,2-6 |
| Challenger Launceston | 2019/01/29 02:35 | Pedro Martinez v Daniel Nguyen | 7-5,7-6 |
| Challenger Launceston | 2019/01/28 02:00 | Daniel Nguyen v Dayne Kelly | 6-3,2-6,7-5 |
| Challenger Da Nang | 2019/01/08 05:00 | Tsung-Hua Yang v Daniel Nguyen | 6-3,6-4 |
| Challenger Shenzhen | 2019/03/14 11:30 | Brayden Schnur v Lorenzo Giustino | 4-6,7-5,6-2 |
| Challenger Shenzhen | 2019/03/12 05:45 | Javier Barranco Cosano v Lorenzo Giustino | 3-6,4-6 |
| Challenger Pau | 2019/02/27 11:40 | Lucas Miedler v Lorenzo Giustino | 4-6,7-6,6-4 |
| Challenger Bergamo | 2019/02/21 10:40 | Luca Vanni v Lorenzo Giustino | 6-3,6-1 |
| Challenger Bergamo | 2019/02/19 12:45 | Zdenek Kolar v Lorenzo Giustino | 2-6,1-6 |
| Challenger Launceston | 2019/02/03 01:30 | Lloyd Harris v Lorenzo Giustino | 6-2,6-2 |
| Challenger Launceston | 2019/02/02 02:00 | Luke Saville v Lorenzo Giustino | 6-7,6-2,5-7 |
| Challenger Launceston | 2019/01/30 23:00 | Maverick Banes v Lorenzo Giustino | 6-7,3-6 |