Stadium: Court 5 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Hua Hin | 2019/08/19 05:15 | Krittin Koaykul v Kittirat Kerdlaphee | 6-4,1-6,15-13 |
| ITF M25 Nonthaburi | 2019/07/29 06:40 | Aaron Addison v Krittin Koaykul | 6-2,6-0 |
| ITF M25 Nonthaburi | 2019/07/23 03:45 | Daisuke Sumizawa v Krittin Koaykul | 6-4,1-6,11-9 |
| ITF M25 Nonthaburi | 2019/07/22 09:35 | Krittin Koaykul v Mehluli D A Sibanda | 6-4,6-4 |
| ITF M25 Nonthaburi | 2019/05/28 05:50 | Rio Noguchi v Krittin Koaykul | 6-3,6-0 |
| ITF M25 Nonthaburi | 2019/05/20 06:55 | Alexander Crnokrak v Krittin Koaykul | 6-1,6-4 |
| ITF M15 Anning | 2019/01/14 01:30 | Kazuma Kawachi v Krittin Koaykul | 7-6,6-2 |
| ITF M15 Anning | 2018/12/31 01:30 | Krittin Koaykul v Francesco Bessire | 3-6,2-6 |
| ITF M15 Hua Hin | 2019/08/27 09:10 | Yuanfeng Li v Nitin Kumar Sinha | 2-6,6-4,10-5 |
| ITF M15 Hua Hin | 2019/08/27 06:40 | Noppadol Noikor v Nitin Kumar Sinha | 3-6,3-6 |
| ITF M15 Hua Hin | 2019/08/19 03:00 | Nitin Kumar Sinha v Young-Hoon Jeong | 2-6,4-6 |
| ITF M25 Nonthaburi | 2019/07/30 04:45 | Nitin Kumar Sinha v Palaphoom Kovapitukted | 6-2,3-6,7-10 |
| ITF M25 Nonthaburi | 2019/07/29 08:00 | Nitin Kumar Sinha v Saranpong Borisutpong | 6-1,1-6,10-4 |
| ITF M25 Nonthaburi | 2019/07/22 04:45 | Thantub Suksumrarn v Nitin Kumar Sinha | 6-3,6-4 |
| ITF M25 Kassel | 2019/07/16 09:50 | Nitin Kumar Sinha v Pavle Daljev | 6-0,4-6,7-10 |
| ITF M25 Kassel | 2019/07/15 11:00 | Nitin Kumar Sinha v Mike Loccisano | 6-3,6-3 |