Challenger Kobe 11/14 02:00 27 [131] Laskutova/Osaka v Rei Sakamoto [180] 4-6,6-1,7-6
Challenger Kobe 11/12 04:45 26 [296] Hynek Barton v Rei Sakamoto [180] 6-3,3-6,4-6
Challenger Kobe 11/11 02:00 25 [416] Max Basing v Rei Sakamoto [180] 6-7,7-6,3-6
Challenger Bratislava 10/26 09:00 14 Rei Sakamoto v Michal Krajci 1-6,2-6
Challenger Brest 10/20 16:00 25 [434] Mae Malige v Rei Sakamoto [177] 7-5,6-1
ATP Stockholm 10/11 09:00 14 [188] Rei Sakamoto v Mark Lajal [146] 1-6,4-6
ATP Shanghai 10/02 11:40 23 [71] Matteo Arnaldi v Rei Sakamoto [188] 7-6,6-4
ATP Shanghai 09/30 08:10 15 [96] Mackenzie McDonald v Rei Sakamoto [190] 4-6,3-6
ATP Shanghai 09/29 11:55 14 [190] Rei Sakamoto v Brandon Holt [114] 6-1,7-5
ATP Tokyo 09/23 02:00 19 [93] Aleksandar Vukic v Rei Sakamoto [189] 6-4,7-6
ATP Tokyo 09/22 05:05 14 [189] Rei Sakamoto v Adam Walton [76] 6-2,6-4
ATP Chengdu 09/16 05:00 14 [189] Rei Sakamoto v Nikoloz Basilashvili [114] 2-6,6-3,1-6
Davis Cup 09/13 06:10 19 [189] Rei Sakamoto v Justin Engel [219] 3-6,7-6,7-10
US Open 08/21 15:00 15 [200] Rei Sakamoto v Ignacio Buse [136] 4-6,6-4,4-6
US Open 08/19 22:40 14 [328] Tyler Zink v Rei Sakamoto [200] 6-4,5-7,6-7
Challenger Sumter 08/12 20:05 25 Holden/Martin v Rei Sakamoto 6-3,6-1
Challenger Lexington 08/01 00:15 26 [205] Rei Sakamoto v Eliot Spizzirri [124] Retired
Challenger Lexington 07/29 17:45 25 [470] Antoine Ghibaudo v Rei Sakamoto [205] 6-1,4-6,2-6
Challenger Bloomfield Hills 07/22 16:55 25 [131] Eliot Spizzirri v Rei Sakamoto [206] 3-6,6-3,6-4
Challenger Winnipeg 07/10 20:05 26 [141] Alexander Blockx v Rei Sakamoto [291] 6-2,7-5
Challenger Winnipeg 07/09 21:15 25 [336] Naoki Nakagawa v Rei Sakamoto [291] 6-7,6-2,3-6
Challenger Cary 07/06 18:15 29 [291] Rei Sakamoto v Liam Draxl [147] 6-1,6-4
Challenger Cary 07/05 15:55 28 [291] Rei Sakamoto v Patrick Kypson [240] 7-6,7-6
Challenger Cary 07/04 15:00 27 [104] Tristan Schoolkate v Rei Sakamoto [291] 6-7,4-6
Challenger Cary 07/03 14:00 26 [325] Patrick Maloney v Rei Sakamoto [291] 6-3,1-6,2-6
Challenger Cary 07/01 17:20 25 [291] Rei Sakamoto v Nicolas Mejia [243] 6-7,6-3,6-3
Challenger Sassuolo 06/18 14:25 26 [186] Luca Van Assche v Rei Sakamoto [294] 6-2,6-3
Challenger Sassuolo 06/18 08:30 25 [294] Rei Sakamoto v Alvaro Guillen Meza [177] 1-6,6-3,7-6
Challenger Perugia 06/10 12:30 25 [291] Rei Sakamoto v Dusan Lajovic [137] 0-6,4-6
Challenger Heilbronn 06/03 13:10 25 Gauthier Onclin v Rei Sakamoto Cancelled