ITF China F4 Qual 04/18 05:00 - Jun Nan Tao v Issei Okamura 4-6,4-6
ITF China F2 Qual 04/14 02:40 - Aoxiong Wang v Issei Okamura 4-6,6-2,6-3
ITF China F2 04/07 05:55 - Issei Okamura v Yan Bai 0-6,1-6
ITF China F2 Qual 04/06 02:00 - Issei Okamura v Zuxin Zheng 6-0,7-6
ITF Japan F4 03/29 01:00 - Seong Chan Hong v Issei Okamura 6-3,6-3
ITF Japan F4 03/28 05:30 - Taiki Hashimoto v Issei Okamura 7-6,1-6,1-6
ITF Japan F3 03/21 02:30 - Issei Okamura v Keisuke Watanuki 6-2,6-3
ITF Japan F2 03/15 01:00 - Masaki Sasai v Issei Okamura 6-3,6-0
ITF Japan F1 03/09 00:40 - Shintaro Imai v Issei Okamura 6-0,6-1
ITF Japan F8 06/24 02:40 - Issei Okamura v Yoshihito Nishioka 0-6,3-6
ITF Japan F7 06/17 02:05 - Issei Okamura v Gengo Kikuchi 4-6,2-6
ITF Japan F5 06/02 01:00 - Issei Okamura v Katsuki Nagao 1-6,6-7
ITF Japan F4 04/04 01:00 - Issei Okamura v Masato Shiga 0-6,3-6
ITF Japan F4 04/02 02:45 - Issei Okamura v Masaki Sasai 6-3,6-3
ITF Japan F4 04/01 03:45 - Yuichi Ito v Issei Okamura 7-6,2-6,6-7
ITF Japan F3 03/27 03:55 - Yuya Kibi v Issei Okamura 6-1,6-1
ITF Japan F3 03/25 02:45 - Issei Okamura v Wishaya Trongcharoenchaikul 6-4,6-2
ITF Japan F2 03/17 01:00 - Issei Okamura v Yuya Kibi 1-6,3-6