Stadium: Court 5 Round: 25 Ground: Hardcourt outdoor
| Meerbusch, Allemagne, Qualifications | 2018/08/12 14:25 | Saito, Takashi v Alexandre Muller | 3-6,0-6 |
| ITF Belgium F7 | 2018/08/09 09:20 | Saito, Takashi v Benjamin Pietri | 6-7,4-6 |
| ITF Belgium F7 | 2018/08/07 16:35 | Saito, Takashi v Vadym Ursu | 6-7,6-3,7-6 |
| ITF Germany F10 | 2018/07/31 10:00 | Manuel Guinard v Saito, Takashi | 7-6,0-6,6-1 |
| Challenger Tampere | 2018/07/21 11:05 | Ivan Gakhov v Saito, Takashi | 6-1,6-3 |
| Challenger Scheveningen Qual | 2018/07/14 10:00 | Saito, Takashi v Alejandro Davidovich Fokina | 3-6,2-6 |
| ITF Japan F8 | 2018/06/13 02:25 | Saito, Takashi v Kousuke Ogura | 6-2,4-6,6-1 |
| ITF Japan F7 | 2018/06/10 01:00 | Saito, Takashi v Rio Noguchi | 6-3,6-4 |
| ITF Thailand F2 | 2018/08/27 02:45 | Kawakami, Rimpei v Wattanakul, Pol | 4-6,2-6 |
| ITF Thailand F1 | 2018/08/21 08:40 | Wattanakul, Pol v Thanapet Chanta | 4-6,4-6 |
| ITF Thailand F1 | 2018/08/20 03:50 | Wattanakul, Pol v Roberts, Charles | 6-3,6-1 |
| ITF Thailand F1 | 2018/08/19 04:45 | Wattanakul, Pol v Yuttana Charoenphon | 6-4,3-6,6-3 |
| ITF USA F8 Qual | 2018/03/17 22:30 | Ram-Harel, Or v Wattanakul, Pol | 6-1,6-2 |
| Bangkok, Thaïlande | 2018/01/09 06:30 | Granollers, Marcel v Wattanakul, Pol | 6-2,6-0 |
| ITF Thailand F11 | 2017/12/04 07:10 | Wattanakul, Pol v Kim, Cheong-Eui | 2-6,6-7 |
| ITF Thailand F10 | 2017/11/27 06:20 | Niesten, Miliaan v Wattanakul, Pol | 6-4,3-6,7-5 |