Stadium: Court 4 Round: 166 Ground: Hardcourt outdoor
| Challenger Kobe | 2019/11/04 06:30 | Ryota Tanuma v Niki, Takuto | 6-3,4-6,7-6 |
| Liuzhou, Chine | 2019/10/21 06:00 | Yunseong Chung v Niki, Takuto | 6-2,7-6 |
| ITF M15 Changwon | 2019/10/16 04:50 | Tagata, Ryohei v Niki, Takuto | 7-5,2-6,6-4 |
| ITF M15 Fayetteville | 2019/09/20 19:30 | Niki, Takuto v Mesquida Berg, Oscar | 7-6,3-6,6-4 |
| ITF M15 Fayetteville | 2019/09/19 14:00 | Niki, Takuto v Nava, Eduardo | 7-5,7-5 |
| ITF M15 Fayetteville | 2019/09/18 14:00 | Niki, Takuto v Goetz, Ryan | 7-5,6-4 |
| ITF M15 Champaign | 2019/09/11 16:00 | Niki, Takuto v Matheus P De Almeida | 1-6,5-7 |
| Sajur, Singles M-ITF-ISR-06A | 2019/09/05 07:50 | Sarouk, Yair v Niki, Takuto | 7-5,6-3 |
| Helsinki, Finland | 2019/11/15 14:00 | Heliovaara, Harri v Ilya Ivashka | 6-3,1-6,2-6 |
| Helsinki, Finland | 2019/11/14 11:00 | Hugo Grenier v Heliovaara, Harri | 1-6,3-6 |
| Helsinki, Finland | 2019/11/13 11:00 | Heliovaara, Harri v Hiroki Moriya | 4-6,7-6,6-3 |
| Helsinki, Finland | 2019/11/11 16:10 | Dubrivnyy, Artem v Heliovaara, Harri | 3-6,2-6 |
| Playford City II, Australie | 2019/10/30 23:30 | Jay Clarke v Heliovaara, Harri | 6-4,6-3 |
| Playford City II, Australie | 2019/10/29 23:30 | Heliovaara, Harri v Mukund Sasikumar | 7-6,6-3 |
| Playford City II, Australie | 2019/10/28 23:30 | Ibrahim, James v Heliovaara, Harri | 1-6,2-6 |
| Challenger Traralgon | 2019/10/23 03:00 | Heliovaara, Harri v James Duckworth | 4-6,2-6 |