Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| ITF M25 - Porto | 2020/09/30 14:15 | Shuichi Sekiguchi v Sadio Doumbia | 6-4,7-6 |
| Challenger Sibiu | 2020/09/23 11:50 | Shuichi Sekiguchi v Felipe Meligeni Rodrigues Alves | 2-6,3-6 |
| Challenger Sibiu | 2020/09/22 08:00 | Shuichi Sekiguchi v Dragos Dima | 7-5,7-6 |
| ITF M25 - Nonthaburi | 2020/01/31 05:00 | Matija Pecotic v Shuichi Sekiguchi | 6-2,7-5 |
| ITF M25 - Nonthaburi | 2020/01/30 07:05 | Jung-Woong Na v Shuichi Sekiguchi | 1-6,4-6 |
| ITF M25 - Nonthaburi | 2020/01/29 07:25 | Kasidit Samrej v Shuichi Sekiguchi | 3-6,2-6 |
| Challenger Bangkok 2 | 2020/01/22 05:25 | Peter Polansky v Shuichi Sekiguchi | 6-3,7-5 |
| ATP Auckland | 2020/01/10 22:00 | Shuichi Sekiguchi v Tatsuma Ito | 3-6,6-4,4-6 |
| ITF M25 - Porto | 2020/09/30 13:30 | Patrik Niklas-Salminen v Ryan Peniston | 6-4,6-2 |
| ITF M15 - Castelo Branco | 2020/09/23 15:05 | Patrik Niklas-Salminen v Natan Rodrigues | 6-7,1-6 |
| Davis Cup | 2020/03/06 18:10 | Manuel Sanchez v Patrik Niklas-Salminen | 4-6,4-6 |
| Challenger Calgary | 2020/02/27 01:40 | Patrik Niklas-Salminen v Maxime Cressy | 3-6,2-6 |
| Challenger Calgary | 2020/02/24 20:55 | Jacob Grills v Patrik Niklas-Salminen | 2-6,4-6 |
| Challenger Drummondville | 2020/02/20 17:45 | Johannes Haerteis v Patrik Niklas-Salminen | 7-6,5-7,7-5 |
| Challenger Drummondville | 2020/02/18 18:50 | Patrik Niklas-Salminen v Go Soeda | 7-6,6-4 |
| Challenger Drummondville | 2020/02/16 21:25 | Kaichi Uchida v Patrik Niklas-Salminen | 1-6,7-6,5-7 |