29‑May‑2017 | Japan F6 | Clay | R32 | 2085 | 766 | Tung Lin Wu [TPE] d. (WC)Oku | 6-1 6-2 | | | | | | | | | |
5‑Sep‑2016 | Korea F8 | Clay | R32 | 958 | 655 | (5)Young Seok Kim [KOR] d. Oku | 6-0 6-2 | | | | | | | | | |
29‑Aug‑2016 | Korea F7 | Clay | R32 | 958 | 1589 | (Q)Jea Moon Lee [KOR] d. Oku | 6-3 7-6(3) | | | | | | | | | |
22‑Aug‑2016 | Korea F6 | Clay | R32 | 933 | 767 | (7)Jung Woong Na [KOR] d. Oku | 4-6 6-1 6-0 | | | | | | | | | |
25‑Jul‑2016 | Vietnam F1 | Hard | R32 | 937 | 484 | (3)Kento Takeuchi [JPN] d. Oku | 6-2 6-2 | | | | | | | | | |
13‑Jun‑2016 | Japan F8 | Carpet | R32 | 902 | | (Q)Kazuki Nishiwaki [JPN] d. (8)Oku | 2-6 6-3 6-4 | | | | | | | | | |
6‑Jun‑2016 | Japan F7 | Hard | R32 | 787 | 603 | (8)Sho Katayama [JPN] d. Oku | 6-1 6-2 | | | | | | | | | |
30‑May‑2016 | Japan F6 | Clay | R16 | 770 | 386 | (5)Yuuya Kibi [JPN] d. Oku | 6-3 6-2 | | | | | | | | | |
30‑May‑2016 | Japan F6 | Clay | R32 | 770 | 518 | Oku d. Takuto Niki [JPN] | 6-2 6-3 | | | | | | | | | |