Round: 28 Ground: Hardcourt indoor
| Challenger St Brieuc MD | 2018/03/30 10:00 | Arends/Weissborn v Ratiwatana/Ratiwatana | 6-4,6-3 |
| Challenger St Brieuc MD | 2018/03/29 12:00 | Safwat/Zopp v Ratiwatana/Ratiwatana | 1-6,1-6 |
| Challenger St Brieuc MD | 2018/03/28 13:55 | Ratiwatana/Ratiwatana v Nedunchezhiyan/Raja | 7-6,3-6,10-8 |
| Challenger Yokohama MD | 2018/03/03 04:05 | Ratiwatana/Ratiwatana v Kamke/Puetz | 6-3,5-7,10-12 |
| Challenger Yokohama MD | 2018/03/02 06:25 | Ratiwatana/Ratiwatana v Ito/Uesugi | 5-7,6-2,10-6 |
| Challenger Yokohama MD | 2018/02/28 05:10 | Ratiwatana/Ratiwatana v Purcell/Whittington | 6-3,7-5 |
| Challenger Yokohama MD | 2018/02/26 05:40 | Ratiwatana/Ratiwatana v Hazawa/Imamura | 6-3,6-4 |
| Challenger Kyoto MD | 2018/02/20 09:25 | Ratiwatana/Ratiwatana v Gong/Hsieh | 6-7,4-6 |