Stadium: Centre Court Round: 25 Ground: Hardcourt outdoor
| Challenger Little Rock | 2019/06/04 20:45 | Daniel Nguyen v Kevin King | 6-2,6-7,6-3 |
| Challenger Sarasota | 2019/04/15 18:40 | Daniel Nguyen v Ryan Shane | 6-7,5-7 |
| Challenger Zhangjiagang | 2019/03/19 05:45 | Daniel Nguyen v Lorenzo Giustino | 0-6,3-6 |
| 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 |
| ITF M15 Guam | 2019/06/05 05:35 | Jurence Zosimo Mendoza v Hiroyasu Ehara | 4-6,4-6 |
| ITF M25 Nonthaburi | 2019/05/23 06:05 | Rio Noguchi v Hiroyasu Ehara | 7-5,6-2 |
| ITF M25 Nonthaburi | 2019/05/22 08:05 | Hiroyasu Ehara v Alexander Crnokrak | 7-5,6-2 |
| ITF M25 Luan | 2019/05/14 05:15 | Hiroyasu Ehara v Issei Okamura | 4-6,2-6 |
| ITF M25 Wuhan | 2019/05/09 02:00 | Wishaya Trongcharoenchaikul v Hiroyasu Ehara | 7-6,6-7,7-5 |
| ITF M25 Wuhan | 2019/05/08 04:20 | Chukang Wang v Hiroyasu Ehara | 0-6,4-6 |
| ITF M25 Matsuyama | 2019/04/10 03:30 | Wishaya Trongcharoenchaikul v Hiroyasu Ehara | 3-6,7-6,6-4 |
| ITF M15 Kashiwa | 2019/04/01 03:00 | Hiroyasu Ehara v Sho Shimabukuro | 4-6,4-6 |