Stadium: Court 17 Round: 60 Ground: Hardcourt outdoor
| Challenger Columbus | 2018/09/15 17:00 | Ricardo Rodriguez-Pace v Jonathan Chang | 6-4,6-7,6-2 |
| ITF USA F21 | 2018/08/01 18:55 | Jonathan Chang v Martin Joyce | 6-2,3-6,2-6 |
| ITF USA F21 Qual | 2018/07/31 17:05 | Jonathan Chang v Gage Brymer | 6-4,6-2 |
| ITF USA F21 Qual | 2018/07/30 15:00 | Jonathan Chang v Alex Blumenberg | 6-2,6-1 |
| ITF USA F21 Qual | 2018/07/28 17:00 | Jonathan Chang v David Metz | 6-2,6-0 |
| ITF USA F20 | 2018/07/25 17:20 | Jonathan Chang v Petros Chrysochos | 0-6,6-3,4-6 |
| ITF USA F20 | 2018/07/24 20:40 | Jonathan Chang v Jenson Brooksby | 6-4,6-4 |
| ITF USA F20 Qual | 2018/07/23 16:50 | Jonathan Chang v Alexander Cozbinov | 6-3,6-2 |
| ITF USA F25 | 2018/09/17 18:00 | Jonathan Sorbo v Emilio Nava | 5-7,3-6 |
| ITF USA F25 | 2018/09/16 17:30 | Felipe Acosta v Jonathan Sorbo | 4-6,6-2,5-7 |
| ITF USA F25 | 2018/09/14 19:00 | Jonathan Sorbo v Kevin Borges Pereira | 6-1,1-6,6-4 |
| ITF Canada F7 | 2018/09/08 13:00 | Jonathan Sorbo v Luka Vukovic | 6-4,2-6,2-6 |
| ITF Canada F6 | 2018/09/01 13:00 | Ronald Hohmann v Jonathan Sorbo | 6-3,6-3 |
| ITF USA F14 | 2018/06/09 16:00 | Matthew Kandath v Jonathan Sorbo | 6-4,6-4 |
| ITF USA F12 | 2018/04/20 13:00 | Edward Bourchier v Jonathan Sorbo | 6-0,6-2 |
| Challenger Drummondville Qual | 2018/03/11 17:45 | Jonathan Sorbo v Chih Chi Huang | 2-6,3-6 |