| Challenger Busan MD | 2018/05/19 02:00 | Roelofse/Smith v Ratiwatana/Ratiwatana | 6-4,6-4 |
| Challenger Busan MD | 2018/05/18 02:00 | Ratiwatana/Ratiwatana v Gonzales/Schnur | 6-2,6-4 |
| Challenger Busan MD | 2018/05/15 07:10 | Ratiwatana/Ratiwatana v Matsui/Statham | 6-1,6-2 |
| Challenger Gimcheon MD | 2018/05/12 06:20 | Roelofse/Smith v Ratiwatana/Ratiwatana | 6-2,6-3 |
| Challenger Gimcheon MD | 2018/05/11 05:30 | Ratiwatana/Ratiwatana v Bury/Peng | 3-6,6-3,10-4 |
| Challenger Gimcheon MD | 2018/05/10 07:20 | Purcell/Saville v Ratiwatana/Ratiwatana | 1-6,4-6 |
| Challenger Gimcheon MD | 2018/05/09 04:30 | Chen/Yi v Ratiwatana/Ratiwatana | 1-6,6-4,8-10 |
| Challenger Seoul MD | 2018/05/03 07:00 | Chen/Yi v Ratiwatana/Ratiwatana | 7-6,4-6,10-8 |