Stadium: Court 3 Round: 54
| ITF Vietnam F2 | 2018/05/08 03:00 | Polkinghorne, Darren v Rio Noguchi | 1-6,2-6 |
| ITF Vietnam F2 | 2018/05/06 04:00 | Kushnirovich, Gary v Polkinghorne, Darren | 6-2,5-7,1-6 |
| ITF Vietnam F2 | 2018/05/05 03:00 | Sookton-Eng, Chanchai v Polkinghorne, Darren | 4-6,3-6 |
| ITF Vietnam F1 | 2018/05/01 03:00 | Polkinghorne, Darren v Nguyen, Phuong van | 3-6,3-6 |
| ITF Vietnam F1 | 2018/04/29 05:30 | Polkinghorne, Darren v Yuichiro Inui | 6-3,6-3 |
| ITF Vietnam F1 | 2018/04/28 03:00 | Polkinghorne, Darren v Kaewsuto, Chayanon | 7-6,6-4 |
| ITF Australia F2 | 2018/03/07 01:35 | Polkinghorne, Darren v Whittington, Andrew | 1-6,4-6 |
| ITF Australia F2 Qual | 2018/03/05 01:40 | Polkinghorne, Darren v Commings, Michael | 6-3,6-2 |
| ITF Vietnam F1 | 2018/04/28 06:00 | Bybel, Nicholas v Crnokrak, Alexander | 6-1,6-3 |
| ITF Australia F4 Qual | 2018/03/24 23:00 | Jesse Delaney v Crnokrak, Alexander | 6-7,6-4,6-4 |
| ITF Australia F3 Qual | 2018/03/19 00:00 | Crnokrak, Alexander v Jayden Court | 7-6,5-7,2-6 |
| ITF Australia F2 Qual | 2018/03/02 23:00 | Crnokrak, Alexander v Taylor, Jason | 3-6,3-6 |
| ITF Australia F1 | 2018/02/27 02:25 | Sookton-Eng, Chanchai v Crnokrak, Alexander | 6-1,6-4 |
| Challenger Canberra | 2018/01/09 00:00 | Crnokrak, Alexander v Geoffrey Blancaneaux | 1-6,2-6 |
| Open d'Australie Playoff Wilcard Australienne | 2017/12/12 23:00 | Alex Bolt v Crnokrak, Alexander | 6-1,6-3,6-3 |
| Open d'Australie Playoff Wilcard Australienne | 2017/12/10 23:00 | Crnokrak, Alexander v Mousley, Bradley | 6-4,1-6,6-3,6-4 |