Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| Challenger Sibiu | 2020/09/23 11:50 | Sekiguchi, Shuichi v Felipe Meligeni Rodrigues Alves | 2-6,3-6 |
| Challenger Sibiu | 2020/09/22 08:00 | Sekiguchi, Shuichi v Dima, Dragos | 7-5,7-6 |
| Nonthaburi, Singles M-ITF-THA-01A | 2020/01/31 05:00 | Matija Pecotic v Sekiguchi, Shuichi | 6-2,7-5 |
| Nonthaburi, Singles M-ITF-THA-01A | 2020/01/30 07:05 | Na, Jung-Woong v Sekiguchi, Shuichi | 1-6,4-6 |
| Nonthaburi, Singles M-ITF-THA-01A | 2020/01/29 07:25 | Kasidit Samrej v Sekiguchi, Shuichi | 3-6,2-6 |
| Bangkok-2, Thailand | 2020/01/22 05:25 | Polansky, Peter v Sekiguchi, Shuichi | 6-3,7-5 |
| ATP - Auckland | 2020/01/10 22:00 | Sekiguchi, Shuichi v Tatsuma Ito | 3-6,6-4,4-6 |
| Te Anau, Simples M-ITF-NZL-01A | 2020/01/04 00:30 | Luke Saville v Sekiguchi, Shuichi | 6-3,6-3 |
| Forli 6, Italy | 2020/09/19 08:00 | Harrison, Christian v Doumbia, Sadio | 6-1,6-4 |
| ITF M15 Caslano | 2020/09/03 16:55 | Remy Bertola v Doumbia, Sadio | 3-6,6-1,6-3 |
| ITF M15 Caslano | 2020/09/02 16:50 | Lucas Gerch v Doumbia, Sadio | 4-6,1-6 |
| ITF M15 Anif | 2020/08/28 10:00 | Peter Heller v Doumbia, Sadio | 6-3,6-2 |
| ITF M15 Anif | 2020/08/27 14:25 | Ozolins, Karlis v Doumbia, Sadio | 2-6,4-6 |
| ITF M15 Anif | 2020/08/26 11:40 | Sebastian Fanselow v Doumbia, Sadio | 2-6,2-6 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/20 09:25 | Doumbia, Sadio v Mathias Bourgue | 5-7,2-6 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/19 08:00 | Doumbia, Sadio v Simon Beaupain | 7-6,6-2 |