Matsuyama, Singles M-ITF-JPN-06A 04/09 02:40 54 Issei Okamura v Iino, Shota 6-2,6-2
ITF - M15 Kashiwa 04/04 01:00 26 Issei Okamura v Jumpei Yamasaki 3-6,2-6
ITF - M15 Kashiwa 04/02 05:50 25 Taisei Ichikawa v Issei Okamura 7-5,5-7,5-7
ITF - M15 Tsukuba 03/27 03:25 25 Issei Okamura v Naoki Tajima 3-6,4-6
Kofu, Qualifications Simples M-ITF-JPN-03A 03/22 02:00 27 Issei Okamura v Ryota Tanuma 4-6,2-6
Kofu, Qualifications Simples M-ITF-JPN-03A 03/21 02:00 26 Takuya Kumasaka v Issei Okamura 1-6,2-6
Kofu, Qualifications Simples M-ITF-JPN-03A 03/19 02:50 25 Aoran Wang v Issei Okamura 2-6,6-4,4-6
ITF - M15 Nishi-Tokyo 03/13 05:25 25 Kawakami, Rimpei v Issei Okamura 6-2,6-1
ITF - M15 Nishi-Tokyo 03/12 01:00 45 Issei Okamura v Hikaru Shiraishi 6-2,6-3
ITF - M15 Nishi-Tokyo 03/11 02:00 45 Issei Okamura v Tan, Li-Wie 6-4,6-0
ITF - M25 Mildura 03/07 02:00 26 Issei Okamura v Sekiguchi, Shuichi 3-6,6-3,2-6
ITF - M25 Mildura 03/05 23:00 25 Issei Okamura v Addison, Aaron 7-5,6-2
Albury, Simples M-ITF-AUS-01A 02/27 23:30 26 Issei Okamura v Crnokrak, Alexander 3-6,2-6
Albury, Simples M-ITF-AUS-01A 02/27 02:15 25 Colin Sinclair v Issei Okamura 6-7,6-2,4-6
Albury, Simples M-ITF-AUS-01A 02/25 23:30 45 Issei Okamura v Calum Puttergill 6-3,3-6,10-6
Albury, Simples M-ITF-AUS-01A 02/24 23:30 45 Issei Okamura v Bosnjak, Mislav 6-2,7-6
ITF M15 Anning 01/10 04:30 26 Issei Okamura v Naoki Tajima 6-4,3-6,4-6
ITF M15 Anning 01/08 02:30 25 Chen, Ti v Issei Okamura 2-6,5-7
ITF M15 Anning 01/01 04:40 25 Tao Mu v Issei Okamura 3-6,6-2,7-5
ITF Hong Kong F3 12/26 03:00 26 Riccardo Bonadio v Issei Okamura 6-3,7-5
ITF Hong Kong F3 12/25 09:35 25 Issei Okamura v Yuki Mochizuki 7-6,7-6
ITF Hong Kong F3 12/24 02:00 54 Issei Okamura v Taisei Ichikawa 6-2,7-5
ITF Hong Kong F3 12/22 02:00 54 Issei Okamura v Tang, Kyle Lok Yin 6-1,6-1
Challenger Kobe 11/11 03:35 46 Grills, Jacob v Issei Okamura 1-6,6-4,6-3
Challenger Kobe 11/10 03:25 45 Ito, Yuichi v Issei Okamura 4-6,7-6,3-6
ITF Australia F8 10/09 00:00 25 Moerani Bouzige v Issei Okamura 7-5,6-1
ITF Australia F7 10/04 03:55 26 Mitchell, Benjamin v Issei Okamura 6-4,1-6,6-1
ITF Australia F7 10/02 00:00 25 Issei Okamura v Stouff, Vincent 6-4,6-4
ITF Australia F6 09/25 00:30 25 Farren, Connor v Issei Okamura 3-6,7-6,6-2
ITF Australia F5 09/21 01:00 27 Klein, Brydan v Issei Okamura 6-3,6-2