| TT Cup | 2021/03/07 17:05 | Tkachenko, Oleksandr v Kovalchuk, Nazar | L | 3-1 |
| TT Cup | 2021/03/06 17:05 | Tkachenko, Oleksandr v Kovalchuk, Nazar | W | 1-3 |
| TT Cup | 2020/11/12 12:25 | Tkachenko, Oleksandr v Kovalchuk, Nazar | W | 1-3 |
| TT Cup | 2020/11/12 11:50 | Tkachenko, Oleksandr v Kovalchuk, Nazar | L | 3-0 |
| TT Cup | 2020/11/11 08:20 | Kovalchuk, Nazar v Tkachenko, Oleksandr | L | 1-3 |
| TT Cup | 2020/07/30 10:50 | Tkachenko, Oleksandr v Kovalchuk, Nazar | W | 0-3 |
| TT Cup | 2020/07/29 10:15 | Tkachenko, Oleksandr v Kovalchuk, Nazar | L | 3-1 |
| TT Cup | 2020/06/30 16:30 | Tkachenko, Oleksandr v Kovalchuk, Nazar | W | 1-3 |
| TT Cup | 2021/12/22 10:40 | Levshin, Anatoly v Kovalchuk, Nazar | L | 3-2 |
| TT Cup | 2021/12/22 08:55 | Andrii Baklykov v Kovalchuk, Nazar | L | 3-0 |
| TT Cup | 2021/12/22 07:10 | Maksiuta, V. v Kovalchuk, Nazar | L | 3-1 |
| TT Cup | 2021/12/19 13:15 | Kovalchuk, Nazar v Volodymyr Plishylo | W | 3-2 |
| TT Cup | 2021/12/19 12:05 | Anton Molochko v Kovalchuk, Nazar | W | 0-3 |
| TT Cup | 2021/12/19 09:45 | Volodymyr Plishylo v Kovalchuk, Nazar | W | 1-3 |
| TT Cup | 2021/12/19 08:00 | Simonchuk, David v Kovalchuk, Nazar | W | 2-3 |
| TT Cup | 2021/12/19 06:50 | Andrii Baklykov v Kovalchuk, Nazar | W | 2-3 |
| TT Cup | 2021/12/22 09:30 | Maksiuta, V. v Tkachenko, Oleksandr | L | 3-2 |
| TT Cup | 2021/12/22 07:45 | Andrii Baklykov v Tkachenko, Oleksandr | W | 2-3 |
| TT Cup | 2021/12/22 06:35 | Levshin, Anatoly v Tkachenko, Oleksandr | L | 3-2 |
| TT Cup | 2021/12/16 13:00 | Tkachenko, Oleksandr v Levshin, Anatoly | L | 2-3 |
| TT Cup | 2021/12/16 11:50 | Tkachenko, Oleksandr v Schepanskiy, Yuriy | W | 3-2 |
| TT Cup | 2021/12/16 11:15 | Tkachenko, Oleksandr v Maksiuta, V. | W | 3-1 |
| TT Cup | 2021/12/16 09:30 | Tkachenko, Oleksandr v Levshin, Anatoly | L | 1-3 |
| TT Cup | 2021/12/16 08:20 | Tkachenko, Oleksandr v Maksiuta, V. | L | 1-3 |