Stadium: Court 7 Round: 44 Ground: Hardcourt outdoor
| ITF M25 Cairns | 2019/09/17 00:00 | Jake Delaney v Kumthonkittikul, W. | 3-6,7-6,6-2 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/09/04 04:50 | Nitin Kumar Sinha v Kumthonkittikul, W. | 4-6,6-0,6-3 |
| Hua Hin, Singles M-ITF-THA-07A | 2019/08/21 06:55 | Kumthonkittikul, W. v Park, Sung Jun | 3-6,2-6 |
| Nonthaburi, Singles M-ITF-THA-01A | 2019/07/30 02:30 | Saito, Takashi v Kumthonkittikul, W. | 6-2,6-4 |
| Nonthaburi, Singles M-ITF-THA-01A | 2019/07/29 02:30 | Kerdlaphee, Kittirat v Kumthonkittikul, W. | 3-6,6-2,5-10 |
| Nonthaburi, Singles M-ITF-THA-01A | 2019/07/23 02:30 | Kumthonkittikul, W. v Anand, Kunal | 6-7,4-6 |
| Nonthaburi, Singles M-ITF-THA-01A | 2019/07/22 02:30 | Mohd Adam Das, Shamirul Shahril v Kumthonkittikul, W. | 4-6,6-2,6-10 |
| Singapore, Singles Qualifying M-ITF-SGP-01A | 2019/06/12 06:30 | Kumthonkittikul, W. v Chin, Christian Didier | 6-3,6-7,1-6 |
| ITF M25 Darwin | 2019/09/22 00:30 | Matthew Leffler v Novakovic, Bosko | 6-3,5-7,10-8 |
| ITF M25 Cairns | 2019/09/15 01:00 | Maher, Will v Matthew Leffler | 6-2,6-1 |
| ITF Singapore F3 | 2018/05/26 04:00 | Matthew Leffler v Tortrakul, Teeradon | 2-6,3-6 |
| ITF Australia F4 Qual | 2018/03/24 03:30 | Sitzoukis, Themi v Matthew Leffler | 6-4,7-6 |
| ITF Australia F3 Qual | 2018/03/16 23:00 | Nicholas Jovanovski v Matthew Leffler | 7-6,6-1 |
| ITF Australia F2 Qual | 2018/03/04 00:30 | Nkomba, Benard Bruno v Matthew Leffler | 6-4,6-3 |
| ITF Australia F1 Qual | 2018/02/26 01:10 | Matthew Leffler v Harper, Patrick | 4-6,6-3,2-6 |
| ITF Australia F1 Qual | 2018/02/25 00:00 | Poric, Alan v Matthew Leffler | 1-6,6-7 |