Stadium: Court 4 Round: 164 Ground: Hardcourt outdoor
| Challenger Seoul Qual | 2017/05/07 01:30 | Raymond Sarmiento v Daniel Nguyen | 6-3,6-7,2-6 |
| ATP Winston-Salem | 2019/08/17 20:00 | Christopher Eubanks v Raymond Sarmiento | 6-3,3-6,4-6 |
| Challenger Lexington | 2019/07/30 17:45 | Evgeny Karlovskiy v Raymond Sarmiento | 7-6,6-3 |
| Challenger Lexington | 2019/07/29 22:00 | Raymond Sarmiento v Martin Redlicki | 7-6,6-1 |
| Challenger Binghamton | 2019/07/24 13:30 | Raymond Sarmiento v Max Purcell | 6-7,7-6,6-7 |
| Challenger Binghamton | 2019/07/23 15:30 | Volodymyr Uzhylovskyi v Raymond Sarmiento | 3-6,6-3,2-6 |
| Challenger Winnetka | 2019/07/08 21:15 | Raymond Sarmiento v Roy Smith | 7-6,4-6,0-6 |
| Challenger Columbus | 2019/06/12 19:55 | Mikael Torpegaard v Raymond Sarmiento | 6-4,7-5 |
| Challenger Columbus | 2019/06/11 14:00 | Nicolas Alvarez v Raymond Sarmiento | 6-7,6-7 |
| ATP Winston-Salem | 2019/08/17 19:40 | Daniel Nguyen v Marcelo Arevalo | 6-4,4-6,7-6 |
| ITF M25 Memphis | 2019/08/16 20:00 | Roberto Cid Subervi v Daniel Nguyen | 6-4,4-6,6-2 |
| ITF M25 Memphis | 2019/08/15 23:00 | Kevin King v Daniel Nguyen | 4-6,3-6 |
| ITF M25 Memphis | 2019/08/14 15:00 | Liam Caruana v Daniel Nguyen | 4-6,6-7 |
| Challenger Winnipeg | 2019/07/13 17:00 | Brayden Schnur v Daniel Nguyen | 6-2,7-5 |
| Challenger Winnipeg | 2019/07/12 17:00 | Daniel Nguyen v Antoine Hoang | 7-6,4-6,6-3 |
| Challenger Winnipeg | 2019/07/11 16:00 | Daniel Nguyen v Enzo Couacaud | 1-6,6-3,6-2 |
| Challenger Winnipeg | 2019/07/09 17:30 | Alexis Galarneau v Daniel Nguyen | 6-1,1-6,5-7 |