Stadium: Court 4 Round: 24 Ground: Hardcourt outdoor
| Challenger Dallas | 2017/02/01 23:50 | Ryan Harrison v Mackenzie McDonald | 6-2,7-6 |
| Challenger Seoul | 2018/05/06 07:00 | Jordan Thompson v Mackenzie McDonald | 6-1,4-6,1-6 |
| Challenger Seoul | 2018/05/05 07:15 | Mackenzie McDonald v Tatsuma Ito | 6-4,7-6 |
| Challenger Seoul | 2018/05/04 04:40 | Mackenzie McDonald v Lloyd Harris | 6-7,7-6,6-3 |
| Challenger Seoul | 2018/05/02 06:00 | Mackenzie McDonald v Kamil Majchrzak | 6-3,6-4 |
| Challenger Seoul | 2018/04/30 04:45 | Mackenzie McDonald v Uisung Park | 7-5,6-2 |
| Challenger Sarasota | 2018/04/16 16:05 | Mackenzie McDonald v Jay Clarke | 6-3,3-6,2-6 |
| ATP Houston | 2018/04/10 01:20 | Frances Tiafoe v Mackenzie McDonald | 6-3,6-3 |
| ATP Miami Qual | 2018/03/20 14:00 | Darian King v Mackenzie McDonald | 2-6,6-4,6-4 |
| ATP Houston | 2018/04/12 18:35 | Taylor Fritz v Ryan Harrison | 3-6,6-0,6-3 |
| ATP Houston | 2018/04/10 20:35 | Miomir Kecmanovic v Ryan Harrison | 4-6,3-6 |
| Davis Cup | 2018/04/08 19:00 | Ryan Harrison v Ruben Bemelmans | 6-3,6-4 |
| ATP Miami | 2018/03/21 15:00 | Ryan Harrison v Joao Sousa | 6-7,6-7 |
| ATP Indian Wells | 2018/03/09 01:05 | Ryan Harrison v Federico Delbonis | 2-6,6-4,5-7 |
| ATP Acapulco | 2018/03/01 23:30 | Ryan Harrison v Alexander Zverev | 4-6,1-6 |
| ATP Acapulco | 2018/02/28 23:30 | Ryan Harrison v Diego Schwartzman | 6-3,5-7,6-4 |
| ATP Acapulco | 2018/02/27 01:00 | John Isner v Ryan Harrison | 3-6,6-7 |