| 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 |
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